Related Clues:

• Septet for sailors
• They have arms
• ''Ships upon untamed __'': Auden
• Neptune’s kingdom
• Baltic and Aegean
• Pirates' domains
• Map expanses
• 'Seven' things for a pirate
• Blue sections of maps
• Poseidon's domains
• "High" waters
• Major bodies of water
• Watery septet
• Homes for 34-Downs
• They're smaller than oceans