sunken

Depressed, fallen in, or hollowed.

Situated beneath the surface of the water or ground; submerged.

Below a surrounding level.

Sunk, in any sense.

Situated below the general surface; below the surface, as of the sea: as, a sunken rock.

Lying on the bottom of a river or other water; sunk.

Past participle of sink

caused, by natural or unnatural means, to be submerged

having a sunken area