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The upper course is the beginning of a river. It starts at the source of the river and continues until the river meets the flat land. The water flows quickly in the upper course and the river is smooth.

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In the middle course the rivers get bigger and wider. It also begins to slow down the land over which it flows in flat land.

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The lower coast is the last stage of a river.

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The river becomes even wider and the water flows more slowly.

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During this stage, the river empties into a lake or the sea.

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This meeting point is called the mouth of the river.

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A riverbed is the land over which a river flows.

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A river basin is a group of river basins that empathy into some sea.

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On the Iberian Peninsula, there are three main drainage basins.

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The contrarian is a river that empties into a bigger river.

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The point where two rivers meet is kind of a conflict.

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A river basin is an area of land that is drained by a river and its tributaries.

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This means that all the precipitation that falls on this area of land goes into one river and its tributary.