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