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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