Related Clues:
- Lunar surface feature
- Alimentary route
- Cold cover?
- Volcanic depression
- An artificial waterway
- Large bowl-shaped hollow
- Cold sort of headwear found in Greenland
- Frozen covering of polar regions
- Hole of volcano or bomb
- Artificial waterway as at Panama (5)
- Artificial waterway as for barges
- Snowy mountain peak
- Fissure in the earth's crust
- Volcanic depresssion
- Man-made strip of water