- butte: a raised, flat area of land with steep cliffs;smaller than a mesa
- current: the swiftest part of any moving body of water
- desert: dry area with few plants; receives less than 10 inches of rain a year
- flood plain: flat land near the edges of rivers formed by mud and silt deposited by floods
- glacier: a large, slow-moving river of ice
- lagoon: shallow body of water partly cut off from the sea
- mountain pass: a gap between mountains
- oasis: a fertile spot in the desert fed by wells or underground springs
- plain: a broad, level area of land
- reservoir: a place where water is kept
- savanna: region with scattered trees and grassland
- tributary: a stream or river that flows into a larger river
- valley: low land between mountains or hills