Before revision: An underwater environment is a environment of, and immersed in, liquid water in a natural or artificial feature (called a body of water), such as an ocean, sea, lake, pond, reservoir, river, canal, or aquifer.
After revision: Underwater life on a flat coral reef off the islet Klein Bonaire in the Caribbean Sea|frameless|1941x1941pxThe underwater environment refers to the region below the surface of, and immersed in, liquid water in a natural or artificial feature (called a body of water), such as an ocean, sea, lake, pond, reservoir, river, canal, or aquifer.