An ancient meteorite crater.
An enclave.
A group of mountains is commonly referred to as a range or a mountain range.
A valley among mountains is commonly referred to simply as a mountain valley.
A group of mountains together is referred to as a mountain range.
topographical
Nearly circular folded mountains are typically referred to as "domes." These geological formations occur when tectonic forces cause the Earth's crust to fold upwards, creating a rounded shape. An example of a dome mountain is the Black Hills in South Dakota. Other types of folded mountains include anticlines and synclines, but domes specifically have that circular or oval appearance.
Schookson
A circular hill is called a "round hill" or a "mound."
Because there in Colorado.
An enclave.
ismas
volcanos
land locked
A quadrangle.
Islands
an island!!
Orbit.