All Things Australia.

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Across
  1. 5. Fremantle's First Prison
  2. 6. WA Limestone Formations
  3. 7. Largest Mammal on Earth
  4. 8. National Park in NT
  5. 9. Swooping Bird
  6. 10. WA Capital
  7. 12. Australian Wild Dog
  8. 13. Qld National Park
  9. 15. WA Desert
  10. 17. Australian capital
  11. 18. Marsupial that likes to sleep a lot
  12. 20. Marine Mammal
  13. 21. Monolithic (large rock)
Down
  1. 1. Large Marsupial
  2. 2. fearsome shark
  3. 3. Perth River
  4. 4. Largest Reef on Earth
  5. 11. Poisonous Spider
  6. 14. WA Reef
  7. 16. the "C" in ACT
  8. 19. NSW mountains