Why do all rivers not flow to the nearest coast?

Gravity makes water flow to the lowest point nearby. The Ocean is the lowest point on Earth's surface, but it is not always the lowest point nearby. A river may pass few kilometers from the coast, but if there is a mountain to the coast side and lower plains on the other, it will flow to the other, obviously.



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Why the Tonle Sap River Is Unlike Any Other River in the World. In this week's Maphead column, Ken Jennings explains how one river in Cambodia ends up changing direction a few times every year.

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According to the National Aeronautics and Space Administration, four of the world's 10 longest rivers flow generally northward: the Nile, the Mackenzie-Peace (in Canada) the Ob and the Lena (in Siberia). In fact, NASA says that there are rivers flowing north on every continent.

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Most lakes have at least one natural outflow in the form of a river or stream, which maintain a lake's average level by allowing the drainage of excess water. Some lakes do not have a natural outflow and lose water solely by evaporation or underground seepage, or both.

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It always does — right? But under Antarctica's ice, water can sometimes run uphill. Under the right conditions, a whole river can spurt from one lake uphill to another lake. That's because the ice weighs so much that it presses down on the water with thousands of pounds of pressure per square inch.

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