Related Clues:

• Atlantis cover, supposedly
• Crossing medium
• It has arms and waves
• Reef setting
• Mariner's milieu
• Most of the Earth's surface
• See 38-Down
• Horse or dog lead-in
• Ross, e.g.
• Breeze source
• Great expanse
• Columbus' venue
• Word with horse or lion
• Salton or Sargasso
• Winslow Homer subject