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Across
  1. 4. Coastal shallow lake
  2. 5. Narrow land strip
  3. 8. Cold treeless plain
  4. 11. Tropical grassland
  5. 14. Mountain with lava
  6. 18. River mouth area
  7. 19. Island nation
  8. 20. Land surrounded mostly by water
  9. 21. Narrow valley
  10. 22. Low area between hills
  11. 23. Deep glacial inlet
  12. 25. Elevated flat land
Down
  1. 1. Curved bay or recess
  2. 2. Desert water spot
  3. 3. Flat grassland
  4. 6. Wet seasonal wind
  5. 7. Wet swampy land
  6. 9. Slow moving ice
  7. 10. Wide sea inlet
  8. 12. Island group
  9. 13. Point of land into sea
  10. 15. Deep narrow valley
  11. 16. Low land area
  12. 17. Hot water spring
  13. 24. Underwater coral formation