RELIEF. Coastland and landscape

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Across
  1. 5. a flat area at higher altitude.
  2. 7. a low and flat area with few trees.
  3. 8. A large bay.
  4. 9. a single mountain.
  5. 10. An area of land completely surrounded by water.
  6. 13. a group of connected mountains.
  7. 15. A wall of rock.
  8. 16. A low area of land.
Down
  1. 1. A large portion of land extending into an ocean or other body of water.
  2. 2. A group of islands.
  3. 3. a deep channel cut out by a river.
  4. 4. An area of land surrounded by water on all sides except one.
  5. 6. A part of a sea or lake that cuts into a coastline.
  6. 10. A narrow neck of land between two larger pieces of land.
  7. 11. an area between two mountains.
  8. 12. An area of the coastline that is made up of deposited sediment.
  9. 14. like a mountain, but smaller.