Related Clues:

• Atlantis cover, supposedly
• Crossing medium
• It has arms and waves
• Mariner's milieu
• Most of the Earth's surface
• Great expanse
• Briny deep
• Humpback's home
• Lighthouse view
• Plethora
• Sight from Cape Cod
• Debussy's 'La Mer,' in English
• Hurricane's birthplace
• Setting for many schools
• Considerable amount