Related Clues:
- Snorkeling destination, perhaps
- A kind of knot
- Boating hazard
- Great Barrier, e.g.
- Site of a shipwreck, perhaps
- Shipping obstacle
- Current creation, sometimes
- Lagoon creator
- It might be just below the surface
- Coastal buildup
- Coral group
- Snorkeler's heaven
- Great Barrier __
- Ship hazard
- Underwater habitat