Bends in a river crossing a lowland are called

The bends in the river are called meanders.  Deltas usually form at the end of these.

Explanation:

Meanders are a series of regular sinuous curves, bends, loops, turns, or windings in the channel of a river, stream, or other watercourse.

Deltas form at lowland areas at the end of a river and lie barely above sea level.

Deltas are wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river. Although very uncommon, deltas can also empty into land. A river moves more slowly as it nears its mouth, or end.

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