1. mesa

flat-topped mountainwith steep sides

2. mountain

highest kind of land

3. mountain pass

gap bewteen mountains

4. mountain range

row of mountains

5. mount of river 

place where a river empties into another body of water 

6. oasis

area of water and fertile land in a desert 

7. ocean 

body of salt water larger than a sea

8. peak 

top of a mountain 

9. peninsula

land that is almost completely surrounded by water

10. plain

area of flat or gently rolling low land 

11. plateau 

area high, mostly flat land 

12. reef

ridge of sand, rock, or coral that lies at or near surface of a sea or ocean

13. river

large stream of water that flows across the land

14. riverbank 

land along a river 

15. savanna

area of grassland and scattered trees

16. sea

body of salt water smaller than an ocean

17. sea level

the level of the surface of an ocean or a sea 

18. slope 

side of a hill or mountain

19. source of river 

place where a river begins 

20. strait

narrow channel of water connecting two larger bodies of water

21. swamp 

area of low, wet land with trees 

22. timberline 

line on a mountain above which it is too cold for trees to grow 

23. tributary

stream or river that flows into a larger stream or river

24. valley 

low land bewteen hills or mountains 

25. volcano

openig in the earth, often raised, through whic lava, rock, ashes, and gases are forced out

26. waterfall 

steep drop from a high place to a lower place in a stream or river