Related Clues:

• Pirates roam them
• Baltic, et al.
• Places for piracy
• South China and Aegean
• Mediterranean and Baltic, e.g.
• Word after open or seven
• Maria on Mars
• They can get high
• Salty expanses
• Indian and Arctic
• Word in many cruise ships' names
• Proverbial heptad
• Red and Black
• They may be high or heavy
• 'High' bodies