A hollow or depression in the earth's surface is a basin. A basin is usually shaped like a bowl, with the sides higher than the bottom. Some are filled with water, some are empty.
Approximately 57 Earths could fit inside a hollow Neptune, taking into account its volume which is about 57 times larger than Earth's.
Height above earths surface is called elevation
A basin is a depression in the earth's surface that can be dry or filled with water.
The Earth's surface layer is called the crust.
Crater: Hollow, Dip, Depression, Basin, Bowl, Cave, cavern, and hole are the synonyms Hump, Bulge, Bump, Lump, and Swelling are the antonyms
A basin
a valley
A depression on the surface of the Earth created by groundwater is known as a cone of depression.
A mountain is a natural, large elevation in the Earths surface. A basin is a depression in the Earths surface containing water.
a valley
A basin
a valley, a canyon, a hole, a gulch, a hollow, a gully
A concave mark is called a "dent" or "depression." It refers to an indentation or hollow area in a surface.
Botches
Deposition by erosion , could fill a depression , the same erosion creates depressions.
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Fossa