Related Clues:

• Passage about North American lake
• One of the royals comes through chamber
• Illusory sight on Mars
• Panama ___
• Barge route
• It may go from sea to shining sea
• Gondola locale
• Water-course where a trainee has to follow vessel
• Preserve a lake or other stretch of water
• Locks are the key to its existence
• Miraculous place with loch and waterway!
• eg Grand Union
• Vessel has a litre - this has much more water
• Privy to a student's course?
• Tube-shaped passage in the body