Related Clues:

• Lettuce
• Kind of lettuce
• Ross Sea sight
• Lettuce variety
• Big chunk of the Atlantic?
• Shipping hazard
• Unemotional person
• Lettuce type
• Floating mass of frozen water
• Renewable freshwater resource
• Salad choice
• Hard-to-get-to-know person, so to speak
• Romaine alternative
• Navigation hazard
• Titanic's undoing