1. Variety of plant and animal life in an ecosystem

2. Small island in the British Indian Ocean Territory

3. Shallow body of water separated from a larger sea

4. Large fruit of a tropical palm tree

5. Area under the jurisdiction of a particular country

6. The remains of a wrecked ship

7. Supreme power or authority

8. Without any permanent residents

9. Mountain or hill with a crater or vent

10. Vast body of saltwater

11. Relating to or occurring in the tropics

12. Loose, granular material on beaches or deserts

13. To set apart or separate

14. Related to the sea

15. Military facility on Diego Garcia

16. Far away from populated areas

17. Largest island in the British Indian Ocean Territory

18. Line of rocks or sand at or near the surface of the water

19. Rock-like formation of marine organisms