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A navigable artificial water channel, usually built as a conduit for human activity.
canal
A deep cleft between cliffs or escarpments, or a rift between two mountain peaks, resulting from weathering and the erosive activity of a river over long periods of geologic time.
canyon
The four primary directions used in cartography and navigation.
cardinal directions
The study and practice of making maps and charts.
cartography
Any naturally hollow underground space large enough for a person to enter.
cave
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A large human settlement.
city
An instrument used for navigation and orientation.
compass
One of several very large, contiguous landmasses into which the Earth's land area is divided.
continent
A region identified as a distinct national entity in political geography.