Question

What is cut off horse-shoe shaped lake​

Answer 1

An oxbow lake is a special kind of lake that only forms next to meandering rivers. It is shaped like a crescent or a horseshoe and presents a unique ecosystem separate from the river.
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Answer 2

The town of Horseshoe Lake is situated in the Mississippi River floodplain at the eastern tip of a U-shaped water body named Horseshoe Lake, which the town is named after. The Lake is a summer recreation spot for residents of nearby Memphis offering boating, swimming, and fishing.

Changes in the course of the Mississippi River resulted in the shape of the lake. The lake is a former meander in the Mississippi River that was cut off, shortening the river, and is no longer connected to the river.

Horseshoe shaped lakes or oxbow lakes are not unusual in the flat plains of the lower Mississippi and other rivers.