UK

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Across
  1. 4. A small mountain
  2. 5. A big, flat area of land
  3. 8. A very dry place with little water
  4. 11. A low area of land between hills or mountains
  5. 12. A cold, treeless area with frozen ground
Down
  1. 1. Land that is higher than the land around it
  2. 2. Land that is lower than the land around it
  3. 3. A place with lots of trees
  4. 6. A large, open area of land with lots of grass and heather
  5. 7. A deep, narrow valley with steep sides
  6. 9. A long, flowing body of water
  7. 10. A very tall hill