Related Clues:

• Atoll features
• Settings of many schools
• Ridges just above or below the sea
• Arctic Circle sights
• Divers' destinations
• Antarctic phenomena
• Little ones are calves
• Greener fish regularly spotted in coral banks
• Underwater hazards
• Frozen floating hazards
• Submerged coral ridges
• Ice mountains
• Nautical hazards mean one takes in sail
• Groups of submerged rock
• Ridges of coral