Ob

The Ob is a big river in Russia.

It is in a place called Siberia. It flows north to the cold Arctic Ocean.

Two rivers meet to make the Ob. These two rivers start in the mountains. The river is very long. It flows into a big bay.

Many fish live in the water. There are more than 50 kinds. People use the water for food. They also use it for power.

Big cities sit on the river banks. One city is named Novosibirsk. A big train track crosses the water there. This helps people travel.

The river can turn to ice. This happens when it gets cold. The water stays frozen for a long time.

The Ob is a major river in Russia.

It sits in western Siberia. The river starts when two streams meet. These streams come from the Altai Mountains. The Ob flows north and west. It eventually flows into the Arctic Ocean.

It enters the sea through the Gulf of Ob. This gulf is the longest estuary in the world. An estuary is where a river meets the sea.

Many rivers flow into the Ob. The largest one is the Irtysh. Together, they form a very long river system. It is the seventh longest in the world. The land around the river changes a lot. In the south, you might see melons and grapes. In the north, the land is Arctic tundra. This is a cold, treeless place.

People live and work near the water. The city of Novosibirsk is on its banks. It is the largest city in Siberia. A big railway crosses the river there. The Ob also helps make power. People use dams to make hydroelectric energy. More than 50 kinds of fish live in the water.

The river can freeze. In the north, the ice stays for many months.

The Ob is a huge river in Russia. It sits in western Siberia.

This river is part of a very long system. It joins with the Irtysh river. Together, they form the seventh-longest river system on Earth. The Ob starts where the Biya and Katun rivers meet. These two streams begin in the Altai Mountains. The river flows north and west. Eventually, it reaches the Arctic Ocean. It enters the sea through the Gulf of Ob. This gulf is the longest estuary in the world.

The land around the Ob changes as you travel. The river crosses many different types of ground. In the south, the valley is warm enough for grapes and melons. As you move north, the land becomes different. You will see steppes, forests called taiga, and many swamps. In the far north, the ground is Arctic tundra. This area is very cold and treeless.

The river also changes with the seasons. In the south, the water freezes from November until April. In the north, the ice stays from October until June.

Many rivers flow into the Ob to make it larger. The Irtysh is its most important tributary. The Irtysh starts in China and is very long. The Ob itself is also quite long. Other rivers like the Tom and the Chulym join the Ob from the east. From the west, the Vasyugan and the Irtysh flow in. These many streams create a massive area called a drainage basin. This basin covers parts of Russia, Kazakhstan, China, and Mongolia.

People have used the Ob for a long time. In the 11th century, traders knew about these lands. They used long paths to reach the river. By the late 1500s, people built settlements like Beryozov. Later, steamboats began to travel the river in 1845. In 1916, there were 49 steamers on the Ob. The Trans-Siberian Railway changed how people moved. It provided a faster way to travel east and west. However, the river is still important for reaching remote places.

Today, the Ob is very useful for many things. It provides drinking water and helps farmers water their crops. People use the river to catch more than 50 kinds of fish.

Large dams also turn the moving water into electricity. The city of Novosibirsk sits on its banks. It is the largest city in Siberia. A famous railway bridge crosses the water there. The river is also home to many oil and gas works. These works can sometimes make the water less clean.

The Ob is a major river located in western Siberia, Russia. It is the westernmost of the three great Siberian rivers that flow into the Arctic Ocean. The other two great rivers in this region are the Yenisei and the Lena. When the Ob joins with its tributary, the Irtysh, they form a massive river system. This system is the seventh-longest in the world.

The river plays a vital role in the geography and economy of the region.

The river begins at the confluence of the Biya and Katun rivers. Both of these streams originate in the Altai Mountains. These mountains eventually transition into the Ob Plateau. The Ob itself flows in a north-westward direction before turning northward. After traveling through the landscape, it winds eastwards into the Gulf of Ob. This gulf is a bay of the Kara Sea. It is also recognized as the longest estuary in the world.

The Ob system is fed by many different tributaries. The Irtysh is the most significant tributary. It originates in China and is actually the furthest source of the entire system. The Irtysh measures 4,248 kilometers from its source to its confluence with the Ob. The Ob itself measures 2,538 kilometers from its source to that same meeting point. Other important tributaries include the Tom, Chulym, Ket, Tym, and Vakh rivers from the east. From the west and south, the Vasyugan, Irtysh, and Severnaya Sosva rivers flow into the Ob.

The environment surrounding the river changes significantly across its length. The river basin covers a massive area of approximately 2.9 million square kilometers. This basin includes parts of Russia, northern Kazakhstan, western China, and a small part of Mongolia. The topography includes steppe, taiga, swamps, tundra, and semi-desert. In the southern upper Ob valley, the climate is warm enough for grapes, melons, and watermelons. However, the lower reaches consist of Arctic tundra.

The river is also icebound for much of the year. At southern Barnaul, ice stays from early November until late April. At northern Salekhard, the ice lasts from late October until early June.

Human history is closely tied to the Ob. As early as the 11th century, Novgorodians were aware of the lands in western Siberia. They established two trade routes to reach the river. One route traveled through the rivers Sukhona, Vychegda, and Usa. The other route used the Northern Dvina and the White and Kara Seas. By the late 16th century, settlements like Beryozov and Obdorsk were founded. In 1845, steamboats began navigating the middle reaches of the river. By 1916, the Ob hosted 49 steamers.

The completion of the Trans-Siberian Railway later provided more direct transport.

Today, the Ob is essential for many human activities. It provides drinking water, irrigation, and hydroelectric energy. The river hosts more than 50 species of fish. Several hydroelectric power plants exist along the river, with the largest being the Novosibirskaya GES. The city of Novosibirsk is the largest city in Siberia and the third-largest in Russia. It sits on the banks of the Ob. The Trans-Siberian Railway crosses the river at this location. The river system also supports navigation, with a total navigable length of 5,300 kilometers.

However, the river faces modern environmental challenges. The Ob catchment is part of the West Siberian petroleum basin. This area contains large oilfields and significant oil and gas infrastructure. These industries are a major source of pollutants. In the lower reaches, concentrations of petroleum products can exceed limits by 9 to 10 times. The oxygen content in the water has been measured at four times lower than normal. Studies have identified pollutants such as phenols, hydrocarbons, iron, manganese, copper, and phosphate in the water.