a construction of wall across a river that holds back the water flowing through the river, creating a reservoir or lake
A system of rivers and streams that drains an area like the Colorado Plateau.
A shape or feature of the Earth's surface, like a delta or canyon.
A natural or artificial wall of earth material along a river or sea that keeps the land from being flooded.
A curve or loop in a river.
A large, nearly level area that has been lifted above the surrounding area.
Tiny bits of rock, shell, dead plants, or other eroded materials transported and deposited by wind, rain, or ice.
The angle or slant of a stream channel or land surface.
A small stream flowing into another (larger) stream or river.
formed by the eroding force and depositions of a river channel. Often occurs when old, slowing rivers form a broad loop that sometimes meet. The old loop forms a cresent-shaped body of water.