Possible Clues:

• Grebes in a rough stretch of water
• Northern part of the Pacific Ocean
• Riga's been rebuilt, the Russian border being fluid
• Pacific arm
• Part of Pacific between Siberia and Alaska
• Live sounds, each in cold waters
• Carefully be erasing what's between Russia and the US in the main
• It's between Alaska and Siberia
• Worker, say, carrying wheels, needs a cold drink
• Part of the North Pacific between Alaska and Siberia