Small rivers that go into large rivers, tributaries, The river bends, meanders, The river starts here, source, Rivers in the mountains are, narrow, Rivers on plains are usually , wider, The river flows slowly , at the mouth, The river flows fast in the mountains, at its source, A wide mouth is called an, estuary, The direction of the river is its , course, A course is in 3 parts, upper, middle and lower.

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