Related Clues:

• Siberian river
• The Trans-Siberian Railroad crosses them
• Caspian feeder
• It flows for 1,575 miles
• Narodnaya is the tallest of them
• Part of the Europe-Asia boundary
• Russian chain
• River to the Caspian Sea
• River through Magnitogorsk
• Range extending about 1,500 miles to Kazakhstan
• Europe and Asia boundary
• Continental divide
• ___ Mountains (Asian border)
• Range bordering Europe
• Mountains forming the Europe-Asia boundary