strait

a narrow body of water that connects 2 larger bodies of water

plain

flatland

prairie

flat grassland (United States)

steppe

flat grassland (Europe/Asia)

savanna

flat grassland (Africa)

cape

small landmass surrounded by water on three sides

peninsula

large landmass surrounded by water on three sides

bay

small body of water surrounded by land on three sides

gulf

large body of water surrounded by land on three sides

oasis

fertile place in the desert that has water

mouth

where a river leads into a larger body of water

delta

low, usually triangular landmasses at the mouth of a river

plateau

a large flat area of land that is higher than its surroundings.

cataract

a section of a rapidly flowing river where water drops suddenly over rocks or a steep gradient, often creating whitewater rapids or powerful waterfalls

isthmus

a narrow strip of land connecting 2 larger land masses