Related Clues:
- Mariner's hazard
- Snorkeling venue
- Where ships may run aground
- Lagoon barrier
- It's mostly underwater
- Ridge of rock under surface of sea
- It's frozen and floating
- Chain of rocks near the surface of the sea
- Ridge of rock just under water
- A floating mountain
- Ridge near the surface of water
- Huge mass of frozen water
- Underwater obstruction
- Maritime danger, mostly underwater
- Ridge of rock or sand just under surface of sea