Related Clues:
- Coral formation - kind of knot
- Rocks in shallow water
- Hazard for ships
- Reduce a sail's surface - shipping hazard
- Shorten sail
- Visibility hamperer
- Reason for a flight delay
- Cloud near the ground
- Biodiverse habitat
- Diver's domain
- Something for snorkelers to look at but not touch
- Pilot's hazard
- Seaman's knot
- Hazy state
- Horror film effect