plunge basin

noun

1. a cavity at the base of a falls or cataract, formed by the action of the falling water.

Word History and Origins

Origin of plunge basin¹

First recorded in 1900–05

Example Sentences

There are four miles of trails; the best views of the falls are from the Chimney View and Plunge Basin overlooks.

From Washington Post

Pack water shoes and you can splash around in the plunge basin.

From Seattle Times