A natural depression in the surface of the land, often with a lake at the bottom
Basin
An arm of a sea or ocean, larger than a bay, that extends into land.
Gulf
A flat grassland in a tropical or sub-tropical region
Savanna
The course taken by a body of water between two land masses.
Channel
A strip of land surrounded by water on three sides.
Peninsula
Bonus: What bird is called the rats of the sea
Segals
The indentation of a shoreline, larger than a cove, but smaller than a gulf.
Bay
A relatively narrow strip of land (with water on both sides) connecting two larger land areas.
Isthmus
A division of an ocean or large body of water partly enclosed by land.
Sea
A group of many islands in a large body of water
Archipelago
A fan shaped deposit of mud at the mouth of a river.
Delta
A relatively flat highland.
Plateau
a deep, narrow valley with steep sides, formed over millions of years by river erosion that cuts through the earth's surface
Canyon
A group of closely spaced mountains or parallel ridges.
Mountain/Mountain Range
A narrow channel of the sea, joining two larger bodies of water.
Strait