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Across
  1. 2. - Wetland with trees and shrubs
  2. 6. - Large area covered chiefly with trees and undergrowth
  3. 8. - Hot spring that intermittently sends up jets of water
  4. 12. - Large natural elevation of the earth's surface
  5. 13. - Large area of flat land
  6. 14. - Large natural stream of water
  7. 15. - Broad inlet of the sea where the land curves inward
  8. 16. - Cold, treeless region
  9. 17. - Deep gorge, typically one with a river flowing through it
  10. 18. - Land surrounded by water
  11. 19. - Ridge of jagged rock or coral near the surface of the sea
Down
  1. 1. - Low area between hills or mountains
  2. 3. - Area of relatively level high ground
  3. 4. - Dry, barren area of land
  4. 5. - Shallow body of water separated from a larger body of water
  5. 7. - Vast body of salt water
  6. 9. - Slowly moving mass of ice
  7. 10. - Grassland ecosystem
  8. 11. - Mountain or hill with a crater through which lava erupts
  9. 17. Grid
  10. 20. - Deep, narrow, and elongated sea or lake drain