Related Clues:

• 'High' places for pirates
• "Sail the seven ___"
• Sailors' domain
• Poseidon ruled them
• Splashy septet
• Word after high or open
• Flat vessels
• Sargasso and Caspian
• "High" or "open" follower
• Caspian and Baltic
• Nautical "seven"
• Flat floating structures
• Noted septet
• Blue areas in an atlas
• Adriatic and Baltic