Related Clues:
- Kind of knot (avoided by sailors?)
- Coral ____ - ____ knot
- Chain of rocks underwater
- Rock formed of coral
- Undersea ridge
- Coral formation - kind of knot
- Rocks in shallow water
- Hazard for ships
- Reduce a sail's surface - shipping hazard
- Shorten sail
- Biodiverse habitat
- Diver's domain
- Something for snorkelers to look at but not touch
- Pilot's hazard
- Seaman's knot