Plunge pool
Depression at the base of a waterfall
Plunge pool
A plunge pool (or plunge basin or waterfall lake) is a deep depression in a stream bed at the base of a waterfall or shut-in. It is created by the erosional forces of cascading water on the rocks at the formation's base where the water impacts. The term may refer to the water occupying the depression, or the depression itself.
Read on Wikipedia · Image Martin Peeks, CC BY 2.5
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