1. Ocean
2. Butte
3. Cave
4. Cliff
5. Canal
6. Canyon
7. Mesa
8. Gulf
9. Mountains
10. Waterfall
11. Glacier
12. Volcano
13. Isthmus
14. Delta
15. Peninsula
16. Oasis
17. Island
18. Hills
19. Valley
20. River
21. Lake
22. Sand dunes
23. Pond
24. Plateau