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Across
  1. 2. Sand hill shaped by wind
  2. 4. Wetlands with reeds
  3. 5. Multiple powerful waterfalls
  4. 7. Natural docking area
  5. 8. Rock or coral undersea ridge
  6. 10. Ridge separating watersheds
  7. 13. Hot water springs
  8. 14. Chain of mountains
  9. 17. Deep oceanic depression
  10. 19. Small sheltered bay
  11. 22. Flat step-like landform
  12. 23. Sea inlet with steep sides
  13. 25. Shallow coastal water body
  14. 28. Narrow waterway
  15. 29. Large sea or ocean inlet
  16. 30. Isolated steep hill
Down
  1. 1. Highest mountain points
  2. 3. Slowly moving ice mass
  3. 6. Passageway through terrain
  4. 9. Flat rock shelf
  5. 11. Flat-topped hill
  6. 12. Steep slope or cliff
  7. 15. Narrow deep valley
  8. 16. Land meeting water
  9. 18. Deep crack or abyss
  10. 20. Elevated areas
  11. 21. Flat, low elevation areas
  12. 24. Depressed land area
  13. 26. Large curved coastline
  14. 27. Cliff or hill with steep face