LAKE

lake,n.1. A large body of standing water in a depression of land or basin supplied from the drainage of an extended area; esp., a natural depression in the surface of the earth containing a reasonably permanent body of water that is substantially at rest. [Cases: Waters and Water Courses  108.C.J.S. Waters §§ 2, 236–237.] 2. A widened or expanded part of a river.

 [Blacks Law 8th]