The Avon estuary in England


An estuary is an inlet of the sea, into which flows a river or stream. Fresh and salt water mix here, so the inhabitants have to cope with both. Some estuaries have extensive mudflats which are exposed at low tide, and teem with life. Many estuaries were formed at the end of the Ice Age, when sea level rose and flooded the coast. If an estuary completely silts up, it will turn into a delta.

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