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Across
  1. 2. River through London
  2. 9. Ocean between Americas
  3. 10. Smallest Great Lake
  4. 11. Northernmost world ocean
  5. 13. River near Tigris
  6. 19. Longest river globally
  7. 21. Ocean near India
  8. 22. Great Lake near Canada
  9. 24. Sea near Central America
  10. 29. Deepest freshwater lake
  11. 30. Soil wearing away
Down
  1. 1. Largest Great Lake
  2. 3. Second Great Lake
  3. 4. Cold Russian region
  4. 5. Island off Africa
  5. 6. Largest enclosed inland water
  6. 7. Lake in Canada
  7. 8. Land almost an island
  8. 12. Largest non-continent island
  9. 14. US island state
  10. 15. River in Germany
  11. 16. Major Southeast Asian river
  12. 17. Asian desert
  13. 18. River in Paris
  14. 20. Europe's second-longest river
  15. 23. Ancient Mesopotamian river
  16. 25. Southeast Asian island
  17. 26. African coastal desert
  18. 27. Largest world ocean
  19. 28. Longest river in Asia