Across
- 3. Arid sandy region
- 5. Cold treeless plain
- 7. River mouth landform
- 9. Deep river valley
- 12. Natural rock curve
- 15. Narrow land strip
- 17. Land between hills
- 18. European mountain range
- 20. Grassland with trees
- 23. Wind-shaped sand hills
- 24. Largest rainforest
- 25. Vast African desert
- 26. Shallow coastal water
- 28. Ring-shaped coral reef
- 30. Erupting mountain
Down
- 1. Volcanic depression
- 2. Hot water spring
- 4. Sacred Indian river
- 6. Highest mountain
- 8. Northern polar region
- 10. Famous waterfall
- 11. Desert water source
- 13. Largest continent
- 14. Land surrounded by water
- 16. Tallest mountains
- 19. Longest US river
- 21. South American river
- 22. Sheltered sea area
- 27. Elevated flatland
- 29. Narrow sea inlet