Map of the Oka depths from Kaluga to Serpukhov

Where did the name come from

There are, as always, many versions of origin. It is believed that the hydronym came from the following languages:

• Proto-Slavic - OKO;
• Lithuanian – AKIS (eye, well);
• Finnish – JOKU (river);
• Proto-European - AQVA (water);
• Gothic – AHA (river);
• Mari – AKA (elder sister).

It is interesting that the Even people call rivers okats. The consonance of the hydronyms with the word OKA is clearly visible. It is hypothetically assumed that the word also has Aryan origin. The river was considered OKOM RA. Perhaps the name was slightly shortened to OKA.

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I love the sea and taiga. I recently decided to take up journalism. I publish educational articles about natural objects and animals.

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K. Paustovsky called the Oka “the most Russian” river. The Slavs who lived along the banks in ancient times called it the “belt of the Mother of God.” In ancient times, a belt was considered a talisman and it was not for nothing that it was worn on the stomach. So the Oka, flowing through the center of Rus', protected and protected something sacred, Russian, indestructible. The all-seeing river, the elder sister (whose?). There is a feeling that Oka is a significant link in the Russian DNA code.

Murom city

The main city in the Murom region is Murom. The map of Russia clearly shows that this administrative center stands on one of the banks of the Oka River. It is one of the oldest settlements in the country. Various fables, legends and myths have been formed about Murom for several centuries. It is almost impossible to say why the city is called this way, because the etymology of the name is unknown to this day. Presumably, this was the name of the tribe that lived in this territory several centuries ago.

At the moment, few passenger ships enter Murom along the watercourse. The Oka River most often serves to transport various types of cargo.

Eye in history

The banks of the river were inhabited back in the days when mammoths roamed the coastal forests. This is evidenced by numerous excavations of ancient settlements and sites. Paleolithic, Neolithic, New Stone Age, then Bronze and Iron Age - during all these periods people lived on the Oka.

Also, thanks to archaeological excavations, it turned out that the river valley arose before the Ice Age. Once upon a time, on the site of Meshchera, an ancient sea splashed. The climate was tropical. Then the sea waters receded. After this it got colder. As the ice melted, rivers began to appear. Possibly the Oka, also a post-glacial river.

Characteristics

Archaeologists have established that the Oka River canyon arose long before the Ice Age. The riverbed of the headwaters is squeezed deep into the limestone. The Serpukhov-Kashira part and further to Kolomna has steep slopes.

In the lower reaches there begins a wide floodplain with numerous oxbow lakes and swamps.

The Oka River is associated with the physical-geographical zoning of forest and forest-steppe zones. The right bank is devoid of forest. Here, occasionally, only birch groves and oak groves are found. The surface is covered with ravines, thanks to very turbulent flood flows. On the left bank of the Oka River, sandy terraces alternate with pine thickets.

Digital indicators according to the water register:

• Length – 1500 km.
• Water area – 250,000 km².
• Flow – 200 -1260 m³/sec.
• The source is 228 m above sea level.
• The mouth is 70 m above sea level.
• Visibility – 55 cm.
• Depth – 1-5 m.
• Shipping – 1180 km.

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According to the parameters of the depth map, the Oka River exceeds the characteristics of the Egyptian Nile. The length of the river highway is almost 200 kilometers longer than the Volga, where the Oka flows.

Source and tributaries

Oka's birthplace is a spring near the village. Aleksandrovka, Oryol region. The source is landscaped, decorated with wooden sculptures, and a chapel is built nearby. People who have been there say that near the spring “it smells like Russia and it’s as if someone who loves you is nearby.”

The source is near the village. Aleksandrovka Oryol district

150 rivers, rivulets and streams flow into the river. Some are only 10 km long, some appear in the spring and are completely dry by mid-summer. The most famous is the Moscow River. The most significant tributaries include:

• Litobezh;
• Tsvetyn;
• Ozerna;
• Rakitnya;
• Pliska;
• Berezuka;
• Kamenka;
• Nepolod;
• Rybnitsa;
• Trosna;
• Fox;
• Knubr;
• Krom;
• Points;
• Optukha;
• Rechitsa;
• Mezenka;
• Orlik;
• Itska;
• Ruda et al.

From the listed names of the tributaries, there really is a breath of something native, Russian, close to the soul.

The tributaries also include the Dobry and Budarin streams and are more than 1.4 km long. The Oka itself flows into the Volga. The color of the water in these rivers is different, and for several kilometers along the Volga you can still distinguish the waters of the Oka.

Tributaries

Main article: "Tributaries of the Oka".

Legend: - stream; - small river; - middle river; - big river. The numbers indicate the distance from the mouth in kilometers.

Rights

• 1494Points
• 1491Litobezh
• 1475Ore
• 1468Ozerna
• 1456Worm
• 1411Knubr
• 1365Optukha
• 1348Fox
• 1303Zusha
• 1288Ista
• 1286Budoyka
• 1254Hand
• 1239Important
• 1234Kolevka
• 1203UPA
• 1202Beryozovka
• 1189Skull
• 1178Freedom
• 1142Zhelov
• 1133Vyrka
• 1097Sokolovka
• 1096Filly
• 1094Uzherd
• 1077Kurovka
• 1075Perodut
• 1060Dugna
• 1051Krushma
• 1043Pig
• 1027Vashana
• 1017Beating
• 1002Book
• 994Yamnitsa
• 980Book
• 963Cow
• 958Kedenka
• 940Besputa
• 932Mutenka
• 895Bolshoe Smedovo
• 870Sturgeon
• 746Pine
• 722Vozha
• 699Trubezh
• 674Listvyanka
• 658Cancer
• 656Gorodnya
• 638Thousand
• 632Istya
• 615Pronya
• 588Alenka
• 583Neplozha
• 573Yaroslavka
• 569Krutitsa
• 556Pair
• 535Tyrnitsa
• 525Middle
• 519Bound
• 517Muscle
• 511Cakes
• 451Talovka
• 426Goose
• 408Syntulka
• 395Tashenka
• 383Exa
• 353Pet
• 350Moksha
• 342Savatemka
• 329Evenka
• 311Vyanka
• 293Koksha
• 282Hawk
• 278Snowed
• 267Vereya
• 251Zheleznitsa
• 206Veletma
• 204Tyosha
• 187Muromka
• 176Big Kutra
• 134Tuja
• 125Reut
• 123Kuzoma
• 103Kishma

Left

• 1486Budarin
• 1483Swan
• 1465Trosna
• 1459Rakitnya
• 1440Rechitsa
• 1428Kroma
• 1426Itska
• 1418Kind
• 1402Tsong
• 1400Rybnitsa
• 1390Orlik
• 1379Mezenka
• 1372Nepolod
• 1370Tsvetyn
• 1344Ratkino
• 1335Kamenka
• 1297Berezuika
• 1281Nugr
• 1267Zlakoma
• 1262Bobrik
• 1253Hand
• 1243Vyrka
• 1242Penikovka
• 1239Litivka
• 1231Setukha
• 1231Vyrka
• 1223Panic
• 1219Middle Vyrka
• 1200Bolshaya Vyrka
• 1185Millstone
• 1173Vyalka
• 1164Zhizdra
• 1152Ptara
• 1132Vyssa
• 1122Ugra
• 1112Yachenka
• 1095Ponikqua
• 1067Komola
• 1051Pytal
• 1035Polyanka
• 1025Dryascha
• 1020Ilova
• 1010Sandy
• 1006Tarusa
• 998Tulovnya
• 990Protva
• 979Nara
• 972Rechma
• 970Drying
• 948Lopasnya
• 940Kireevka
• 925Kremnica
• 921Kashirka
• 866Sholokhovka
• 855Moscow
• 842Shchelinka
• 829Price
• 770Mityaevka
• 745Solotcha
• 598Kishnya
• 593Kistryanka
• 513Ushna
• 504Shtyga
• 479Pra
• 437Thawed
• 322Unzha
• 261Salka
• 260Blueberry
• 227Dubrovka
• 222Ilevna
• 191Ushna
• 186Mothra
• 152Visha
• 145Chucha
• 87Klyazma
• 58Seimas

Settlements on the Oka

Running through 7 regions of the Russian Federation, the river visits many cities. Areas visited by the river:

• Orlovskaya;
• Moscow;
• Kaluzhskaya;
• Tula;
• Nizhny Novgorod;
• Vladimirskaya;
• Ryazan.

On the banks of the river there are cities such as:

• Moore;
• Dzerzhinsk;
• Stupino;
• Tarusa;
• Eagle;
• Pavlovo;
• Aleksin;
• Kasimov;
• Serpukhov;
• Kaluga;
• Kolomna;
• Ryazan;
• Kashira;
• Konstantinovo;
• Kasimov;
• Protvino et al.

Cities with a rich history and ancient architecture seem to have deliberately accumulated on the banks of the Oka River.

What cities are on the river

More than a dozen large and small settlements are located along the banks of the river, with which historical events are connected. Many settlements along the Oka River were founded in ancient Rus' for a specific purpose.

Eagle

Oka River in Orel
In 1566, on the instructions of Ivan the Terrible, the Orel fortress was built to protect the southern borders of Muscovy. On the Oryol lands, where the Oka originates, during the Great Patriotic War, Russian soldiers defended the approaches to the capital. Orel was named the city of the “first fireworks” after the victorious battles of 1943.

Serpukhov

The first mention of the fortress on the banks of the Oka dates back to 1336. The outpost of the Moscow Principality held back the Mongol-Tatars and Lithuanian-Polish conquerors on its borders. On the banks of the Oka, Ivan the Terrible trained military forces. Boris Godunov's armed convoys stood here. Vasily Shuisky prepared warriors for the war against the Crimean Tsar. Ivan Bolotnikov assembled a shock detachment of the peasant army in Serpukhov.

Ryazan

Founded in 1095, Ryazan-Gorodishche was the center of the principality of the same name. During the Civil War it was repeatedly ravaged, and in 1208 it was burned to the ground. The ancient city was revived and flourished again. The Ryazan Kremlin with its bell towers, cathedrals and ancient chambers has survived to this day.

N. Novgorod

Oka Nizhny Novgorod
The founding father of the city is Grand Duke Vsevolodovich. He equipped a bridgehead at the mouth of the Oka for his warriors preparing campaigns against the Bulgars. In 1221, the prince ordered “an important place to be strengthened beyond Russia.”

N. Novgorod is associated with the names of the liberators from the Polish invaders in 1611. Minin and Pozharsky gathered the famous militia, which influenced the history of Rus'.

Kaluga

The Kaluga fortress was built in the 14th century on the Russian-Lithuanian border. In those days it passed along the Oka. The outpost was placed between deep ravines on a high and steep bank to guard the approaches to the Moscow principality.

Kaluga

Along the territory of 13 regions where the Blue Route passes, there are historically significant settlements:

• Kolomna.
• Moore.
• Dzerzhinsk.
• Aleksin.
• Kasimov.
• Protvino.
• Tarusa.
• Stupino.

In ancient times, cities and fortresses on the Oka borders and yars were protected by Russian citadels.

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Bridges, crossings

There are several railway bridges on the Oka:

• Aleksinsky;
• Serpukhovsky;
• Stupinsky;
• Kolomensky;
• Muromsky;

Sartakovsky railway bridge
Many road bridges:

• Gagarinsky;
• Turyninsky;
• Shchurovsky;
• Kasimovsky;
• Pavlovsky pontoon;
• Sartakovsky;
• Lakes pontoon;
• Korobcheevsky;
• Dugninsky pontoon;
• Muromsky;
• Molitovsky;
• Ryazansky;
• Kanavinsky;
• Gnilitsky;
• Myzinsky;
• Nizhny Novgorod.

Dugninsky pontoon bridge
There are also ferry crossings on the Oka River:

• Yushta - Pribrezhny (Ryazan region);
• Lukhovitsy – Beloomut;
• Lukhovitsy – Dedinovo;
• Lukhovitsy - Catchers;
• Elatma – Mayak-Lasinsky;
• Pavlovo – Tumbotino (Nizhny Novgorod region), etc.;

Mouth of Lopasnya (Senkin Ford)

The historically memorable place on the river “Senkin Ford” is located near the river. Lopasni. It was in this place that medieval enemy raiders crossed the Oka.

Reservoirs and hydroelectric power stations

Only 2 hydroelectric complexes were built on the river in Ryazan (Kuzminsky) and Moskovskaya (Beloomutsky). The hydraulic structures contain locks for the passage of ships and dams.

In the 30s of the last century, it was planned to build the Kaluga hydroelectric power station (525 million kW), with a large reservoir almost 5 km wide and tens of kilometers long. The construction of the hydraulic structure was placed under the control of the NKVD. According to the plans of the party elite, the hydroelectric power station was supposed to be completed in 1941. Grandiose plans were crossed out by the war.

Surprisingly, there are no reservoirs on the river. The river has retained its natural flow. Natural reservoirs are located on the tributaries of the Oka. So, for example, R. Yachenka near the city of Kaluga has a reservoir. It is noteworthy because competitions were held on it at the 1980 Olympics.

Oka River in the Tula region

The Oka is one of the largest rivers in Central Russia, its length is more than 1,500 km, the floodplain in the middle reaches is up to 2.5 km wide, and the basin is 245 thousand km² in area. Oka goes through the Oryol, Tula, Kaluga, Moscow, Ryazan, Vladimir and Nizhny Novgorod regions. With the arrival of winter, ice starts to fall on the Oka River; the ice melts only in early April. During high water, the water rise reaches 10-12 meters, and the spill can cover a floodplain up to 5 kilometers. The spring flood lasts almost two months. To control floods and facilitate navigation, two locks and two dams were built on the river. One lock with a dam is located near Beloomut in the Moscow region, the second, Kuzminsky, operate in the Rybnovsky district of the Ryazan region.

Fish species typical of the Volga basin are also found in the Oka. The main one is bream, but it is easy to find other representatives of this genus: bluefish, glazed, and silver bream. Among the cyprinids, we note roach, rudd, bleak, sabrefish, podusta, asp, ide, dace, carp, gudgeon and chub. One sterlet was spotted among the whitefish. The perch family is represented by ruffe, perch and pike perch. Pike are also found everywhere. However, it should be remembered that according to the Fishery Rules, catch should not exceed the established sizes. For asp and pike perch this is 40 centimeters, 32 for pike, 25 for ide with bream, 24 for podust, 22 for sabrefish, 90 only for catfish. Fishing during spawning is allowed only with a fishing rod with a float, and at night it is prohibited for all floating craft, excluding boats with a carrying capacity of up to 100 kilos.

Being the only river in the region along which navigation is carried out, the Oka near Tula has its own specifics in terms of fishing methods. On average, the 400-meter channel sometimes shrinks to 50, the depth of the river varies in the range from a meter to five, and there are potholes up to eight meters. Accordingly, the speed of the current, which is already decent in narrow places, on the rifts is sometimes compared with the speed of the flow of a mountain river. This feature of the river poses difficult but interesting challenges for the fisherman.

On the other hand, fishing on the Oka in the Tula region will offer a goal to the most demanding fisherman: the number of species of fish living here reaches up to fifty. For example, an excellent place, by the way and with the possibility of going down to the shore by car, is located near the village of Aidarovo. There are plenty of riffles, shallows, and rock spits here; there are also pits with reverse flow of water. The riffles are usually favored throughout the summer by chub hunters, who willingly go after the Maybug and spindle, and from the spit it is worth practicing long casts, with a spinner or live bait, against pike. It’s especially good to check holes at night for burbot or catfish. In a word, there is a place for floaters, bottom fishers, and spinning anglers to unwind. Connoisseurs of float wiring will also find their place.

In the summer, especially when it’s hot, the predatory fish of the Oka in the Tula region becomes finicky: to find large specimens, you have to go to spot stops with a fishing rod and live bait. But smaller predators, weighing up to a kilogram, regularly take on spinning rods with almost any equipment. Night fishing is especially good: a donk equipped with live bait, thrown into a promising pool at sunset, will certainly please the fisherman with a decent catch when darkness falls.

At the end of summer, the area is sometimes covered by prolonged rains. Elsewhere, this could have negative consequences for fishing - such as rotting grass, lack of oxygen in the water, etc. Here, on the contrary, these are the most fishing days - since the white fish begins to continuously feed, different types of white persistently reach for the shore, where they become the prey of a fisherman who is not capricious to the weather. Moreover, a predator also rushes to the shore for linen. And here you can use literally everything - from live bait with a spinner to an elastic band and a wobbler: the chances of lifting a 5-kilogram or even more trophy out of the water are greater than ever. And it’s even a pity that the period of rain is short-lived: the water will subside a little and the fish will return to normal. But those who made it will never regret that they had to get wet for a day or two in the rain.

Shipping and canals

The river has been used since the medieval period as an important trade route. Through tributaries and portages, the river connected the Don, Dnieper, Desna and Mother Volga. Regular shipping began in the 19th century. Locations of that time:

• N. Novgorod - Ryazan;
• Kashira - mouth;
• Kolomna - N. Novgorod.

In summer, both the tributaries and the Oka itself became low-water, which made it difficult for ships to pass. To solve this problem, dams and locks were built. On the river In Moscow, these are the Krasnokholmsky and Babyegorodskaya dams. By 1878, 6 dams with a lock system were put into operation. This provided the necessary fairway for ships as far as Moscow.

Port of Serpukhov

Modern navigation is represented mainly by ships with shallow draft, and in most of the water area it is completely absent. The surviving part is represented by tourist cruise voyages. It must be said that the number of such flights has tripled by 2021. In 2021, the river became so shallow that cruises along it were all cancelled. No dredging or clearing work is being carried out. This leaves no hope for the future of shipping.

Ports on the river are located in Serpukhov and Kolomna.

Volga - mouth of the Oka

One of the largest rivers on planet Earth is the Volga. It covers 4 republics and 11 regions. The river is located in the Caspian Sea basin. Its name comes from the Slavic words “moisture” or “vologa”. It is fed by melting snow, ice, and groundwater. Flood occurs in the spring-summer season, often in April-June. In winter and summer, the river is characterized by low water, and in autumn there are small floods due to rain. The water level is constantly fluctuating. The depth varies significantly in different areas of the river. After the construction of dams and the formation of several reservoirs, the flow of the watercourse was completely regulated.

The river in Murom is very rich in many species of fish, in particular pike perch, pike, bream, ide, asp, etc. Thanks to its large tributaries, the Oka is considered a full-flowing stream. In the nearby area there are nature reserves and bases, holiday homes and sanatoriums. The river valley enchants with its forests, pine forests and birch forests. The waters are quite turbulent; in some parts of the watercourse the current speed reaches 0.5 m/s. Small waves wash away everything that comes their way: blocks of clay, bushes on the banks, terraces, boulders, stones.

Aquatic life and flora

The Oka is still considered one of the richest rivers in the world. Its waters are home to almost 30 species of ichthyofauna. Therefore, fishing on the Oka is extremely popular. Fishermen are experienced people and know that carp (carp) can only be caught in the lower reaches. There are excellent wintering pits and a vast floodplain. But bream can be caught anywhere in the river and is quite a decent size. What other fish are found in the river:

• silver carp;
• silver bream;
• asp;
• chub;
• roach;
• rudd;
• tench;
• White amur;
• ide;
• crucian carp

Previously, they also caught sturgeon with beluga and sterlet in addition. Now these fish are not found in the river.

The shores are favored by beavers, muskrats, muskrats and muskrats. Shore swallows and European bee-eaters nest.

The underwater green world is thriving. Diatoms, green, blue-green, golden, yellow-green - a total of 151 genus of algae. Higher aquatic plants are represented by:

• water lilies;
• reed;
• duckweed;
• water paint;
• cattail;
• sedge;
• calamus;
• marigold;
• trilobed;
• pondweed;
• arrowhead;
• cane;
• capsule;
• water manna;
• pike;
• reeds;
• alder

Flora and fauna of the Oka River

The basin of this river covers a vast area and it flows through several areas, which is believed to be the reason for the presence of all kinds of animals and plants. In addition to various settlements, the river bed passes through broad-leaved plantations, namely through Eastern European forests, where pedunculate oaks are considered the main representatives. In addition to deciduous forests, you can also find coniferous forests, with the presence of spruce and pine trees.

The following interesting plants grow within the Oka River:

• brilliant pondweed;
• narrow-leaved pondweed;
• curly pondweed;
• teloresis;
• hornwort;
• yellow egg capsule;
• watercolor;
• duckweed;
• reed;
• water manna;
• common arrowhead.

It is quite natural that this is not a complete list and in the Oka River you can find a number of other, no less common plants.

Ecology

The river is one of the most polluted water bodies in Russia. Sand mining in the water area and uncontrolled deforestation contribute to the collapse of the coastline. The river becomes wider, but shallower. The surge wave from passing ships acts in exactly the same way. The shore is being washed away and collapses.

Over the past 65 years, the Oka has become smaller by 2 m when measured near Kashira and by 1.7 m near Serpukhov. It is noteworthy that federal budget funds were even allocated for dredging the bottom in 2007, but work never began.

The runoff of water from livestock farms, of which there is plenty along the banks, brings all the dirt to the Oka. Chemicals washed off fields. Water from industrial enterprises. Too much water withdrawal from the river. These factors are killing Oka year after year, slowly but surely. You can’t drink Oka water, it’s only suitable for those. needs.

Water register data

Code 09010100112110000017555 is the code number assigned to the Oka River in the water register of the Russian Federation. Number 110001755 – assigned r. code. Oka on hydrological study (HI).

The indicated number codes were assigned by the Federal Agency for Water Resources, according to the data of the geographic information system for water management zoning of the territory of the Russian Federation.

And also R. Oka has the following assigned codes:

• 09.01.01.001 – river basin code;
• 10 – volume number according to GI;
• 0 – release according to GI.

According to the State Water Register of the Russian Federation:

1. the river belongs to the Oka basin district;
2. section of the river of water economic importance - Oka from the source to the city of Orel;
3. river sub-basin of a river - basins of river tributaries before confluence with the Moksha River;
4. river basin - Oka.

The waters of the river basin are used for shipping.

This issue is monitored and maintained by:

• Volzhskoe State Budgetary Institution - the section from the mouth of the Oka to the Seima Canal;
• FSUE “Canal named after. Moscow" - a section from the Seimas to the city of Kaluga.

Tourism and attractions

Nevertheless, tourism on the Oka River is quite flourishing. The famous cruise tours have become very popular. The 10-day “Moscow Around the World” is the only one that offers a circular route passing along the Oka and Volga with stops in ancient cities.

1. Prioksko-Terrasny Nature Reserve. Located near Serpukhov. A unique place taken under UNESCO protection.
2. Historical buildings in Aleksin, Pavlov, Murom, Nizhny Novgorod.
3. Kolomna and Ryazan Kremlins.
4. The remains of Divyagorsk, built in the 11th century as a fortress.
5. Kasimov Orthodox and Muslim monuments.
6. Numerous museums of Tsiolkovsky, Yesenin, Tsvetaeva, Chizhevsky, Paustovsky.
7. Shukhov Tower in Dzerzhinsk.
8. Polenovo near Tula.

Prioksko-Terrasny Nature Reserve

People also go to the source of the river. This place is considered holy. Childless couples and families with children, just tourists drink water from the source and swim.

The most picturesque places are given over to recreation centers and sanatoriums with treatment with water from mineral springs.

Old Russian fortress Divyagorsk

Poets and writers who lived on the banks of the Oka wrote beautiful lines about it. They called the river the decoration of Rus', songful, ageless, bright.

Map of the Oka depths from Kaluga to Serpukhov

Pilot map of the Oka River from the mouth (Gorky) to Shchurovo

Ministry of River Fleet of the USSR Main Directorate of Waterways and Hydraulic Structures Moscow-Oka Basin Route Directorate

Layout of map sheets (part 1) and symbols

Oka River

- the largest right tributary of the Volga River, almost 1500 km long (1498.6 km), flowing through the territory of 7 regions of Central Russia, on the banks of which cities such as Orel (Oryol region), Kaluga (Kaluga region), Aleksin (Tula region) are located. , Serpukhov (Moscow region), Kashira (Moscow region), Kolomna (Moscow region), Konstantinovo (Ryazan region), Ryazan (Ryazan region), Kasimov (Ryazan region), Murom (Vladimir region), Pavlovo (Nizhny Novgorod region), Dzerzhinsk (Nizhny Novgorod region) and Nizhny Novgorod.

Source, mouth and tributaries of the Oka

The source of the Oka River is located near the village of Aleksandrovka in the Glazunovsky district of the Oryol region, then the Oka rushes to the east, receiving water from dozens of tributaries, the most famous of them: the Moscow, Klyazma, Ugra, Nara, Protva rivers. And the mouth of the Oka is in Nizhny Novgorod, where it flows into the Volga. The Oka water carries a lot of peat out of the swamps and is very different in color from the Volga water. The water boundary can be discerned several kilometers after the confluence of the two rivers. The Oka drainage basin area is 245,000 sq. km.

Oka cannot boast of great depths. At the confluence of the Moscow River into the Oka, the depth is 6.8 meters; in the area from Kolomna to Ryazan there are places with a depth of up to 10 meters along the ship's passage, but the average depth is from 3 to 6 meters. Above the gateway in Beloomut, the depth of the Oka is 4.2 meters, below - 1.9 meters. At the waterworks in Kuzminsk - 2.5 and 1.6 meters, respectively. In the Ryazan region the depth is from 2.8 to 8 meters. On the section from Ryazan to Kasimov there are places with a depth of up to 13.8 meters (between the Ustransky and Volgansky rifts). In the Kasimov Oka area its depth ranges from 3.5 meters to 7.8 meters, in Murom - from 2.1 to 3.6 meters. At the confluence of the Oka and the Volga in Nizhny Novgorod, its depth is 3.6 - 4.1 meters.

Disasters

There were no global disasters on the river. Only cars regularly fall through the ice and people die. The most notable incidents are as follows.

The shallowing of Meshchera is an all-Russian catastrophe. The problem is related to the drainage of swamps during Soviet times. There is an oxbow river here, which is becoming increasingly swampy. Peat bogs burn every year. But now there are poisonous snakes in abundance here.