Related Clues:

• Deep
• Drink
• Siberian river
• See 9-Down
• The Trans-Siberian Railroad crosses them
• Sea
• Caspian feeder
• It flows for 1,575 miles
• Narodnaya is the tallest of them
• Part of the Europe-Asia boundary
• Drink, so to speak
• Liner locale
• Place for a beach
• 'Wavy waste,' to Thomas Hood
• Russian chain