VALLEY

• a low area of land between hills or mountains.

PLAIN

• A large area of land with few trees

REEF

PLATEAU

• An area of relatively flat, high ground

ISLAND

• Any piece of subcontinental land surrounded by water

RIVER

• A natural water source usually heading towards ocean

LAKE

• Body of still water

MOUNTAIN

• A large landform stretching above other land

STRAIT

• A narrow passage of water connecting two seas or large areas of water

PENINSULA

• A land form surrounded by water on 3 sides

ISTHMUS

• A narrow area of land connecting two larger area of land

ARCHIPELAGO

• A clutter of islands

CANYON

• Deep ravine between pairs of cliffs

DELTA

• A triangular area where a major river divides into a larger river

GULF

• A large bay that is an arm of an ocean or sea