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area of land drained by a given river and its branches; area of land surrounded by lands of higher elevations
wide strait or waterway between two landmasses that lie close to each other; deep part of a river or a waterway
flat, low-lying land built up from soil carried downstream by a river and deposited at its mouth
imaginary line that runs around the earth halfway between the North and South Poles; used as the starting point to measure degrees of north and south latitude
part of a large body of water that extends into a shoreline, generally larger and more deeply indented than a bay
one of many lines on the global grid running from the North Pole to the South Pole; used to measure degrees of longitude
land with steep sides that rises sharply (1,000 feet of more) from surrounding land; generally larger and more rugged than a hill
stream of either cold or warm water that moves in a definite direction through an ocean
one of many lines on the global grid that circles the earth north or south of the equator; used to measure degrees of latitude
characteristic of a place occurring naturally, such as a landform, body of water, climate pattern, or resource
line of the global grid running from the North Pole to the South Pole through Greenwich, England; starting point for measuring degrees of east and west longitude
source (of a river)
place where a river or stream begins, often between a coastline and one or more islands off the coast
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