Charlie's Crazy Crossword

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Across
  1. 3. isolated hill with steep sides and a flat top (similar to but narrower than a mesa).
  2. 6. large open area of grassland, especially in the Mississippi River valley
  3. 11. a ring-shaped reef, island, or chain of islands formed of coral
  4. 12. A large underground chamber, usually of natural origin
  5. 13. A piece of land that is almost surrounded by water
  6. 15. a wide strait in between a continent and an island
  7. 16. A vast treeless Arctic region in which the subsoil is permanently frozen
  8. 18. A stretch of salt water that is separated from the sea by a low sandbox or coral reef
  9. 20. A deep inlet of the sea almost surrounded by land
  10. 21. An area of low-lying, uncultivated ground where water collects
  11. 23. large natural stream of water flowing in a channel to the sea, a lake, or another such stream
Down
  1. 1. a hot spring that intermittently sends up fountain like jets of water and steam into the air
  2. 2. an area of land overgrown with dense forest and tangled vegetation, typically in the tropics
  3. 3. A body of water that is connected to an ocean or lake
  4. 4. A group of islands
  5. 5. a long narrow arm of the sea bordered by steep cliffs
  6. 7. an artificial waterway for navigation, irrigation, etc
  7. 8. an area of relatively level high ground
  8. 9. a deep gorge, typically one with a river flowing through it
  9. 10. isolated flat-topped hill with steep sides, found in landscapes with horizontal strata.
  10. 14. a narrow strip of land with sea on either side, forming a link between two larger areas of land
  11. 15. steep rock face, especially at the edge of the sea
  12. 17. A mound or ridge of sand or other loose sediment formed by wind
  13. 19. low lying land that is flooded in wet seasons or at high tide
  14. 22. A large area of flat land with few trees