Related Clues:

• "Sail the seven ___"
• 12,000 pounds = six ___
• Sailors' domain
• A boatload
• Poseidon ruled them
• Splashy septet
• Word after high or open
• Sargasso and Caspian
• "High" or "open" follower
• Caspian and Baltic
• Nautical "seven"
• Noted septet
• Blue areas in an atlas
• Adriatic and Baltic
• Word with open or seven