Last seen in:
Related Clues:
- Ring-shaped formations
- Raise charge in case of rapids or rocks
- Caroline Islands components
- Ring-shaped islands
- Some endangered ecosystems
- Atolls, e.g
- The Maldives, for instance
- Submarine ecosystems
- Lagoon enclosures
- They may top extinct volcanos
- Many Pacific islands
- Perils for mariners
- Hazards for boaters
- Common Pacific groupings
- Fragile ecosystems