1. Geographic Features

2. Plain
land with relatively low relief, that is flat or gently rolling

3. Desert
region that receives an extremely low amount of precipitation, less than enough to support growth of most plants.

4. River
natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river.

5. Delta
a landform that is formed at the mouth of a river, where the river flows into an ocean, sea, estuary, lake, or reservoir

6. Tributary
a stream that flows into a larger stream or other body of water

7. Isthmus
a narrow strip of land connecting two larger land areas usually with water on either side

8. Island
any piece of land that is surrounded by water

9. Archipelago
a chain or cluster of islands

10. Peninsula
a piece of land that is bordered by water on three sides but connected to the mainland

11. Reef
a rock, sandbar, or other feature lying beneath the surface of the water

12. Mountain Range
a geographic area containing numerous mountains

13. Valley
an elongated lowland between ranges of mountains or hills

14. Canyon
a deep ravine between cliffs often carved from the landscape by a river

15. Plateau
is an area of highland, usually consisting of relatively flat terrain

16. Lake
a large inland body of fresh water or salt water

17. Marsh
an area of soft, wet, low-lying land, characterized by grassy vegetation

18. Ocean
entire body of salt water that covers more than 70 percent of the earth's surface

19. strait
a narrow channel of water that connects two larger bodies of water

20. Gulf
large area of a sea or ocean partially enclosed by land

21. Bay
a body of water partially enclosed by land but with a wide mouth