Which body of water has land all around it: a lake or a river?
body of water
A body of water is a large area of water, such as a lake or an ocean. (水域) 一大片
Land is the part of the world that consists of ground, rather than sea or air. 陆地
Geological definition of Lake
Lake, any relatively large body of slowly moving or standing water that occupies an inland basin of appreciable size. Definitions that precisely distinguish lakes, ponds, swamps, and even rivers and other bodies of non- oceanic water are not well established.
It may be said, however, that rivers and streams are relatively fast moving; marshes and swamps contain relatively large quantities of grasses, trees, or shrubs; and ponds are relatively small in comparison with lakes. Geologically defined, lakes are temporary bodies of water.