Maine Has The Largest Tidal Whirlpool In the Western HemisphereMaine Has The Largest Tidal Whirlpool In the Western HemisphereDid you know that just off the coast of Eastport, Maine is the largest tidal whirlpool in the western hemisphere? It's the 'Old Sow' whirlpool has a diameter of approximately 250 feet.Andy CapwellAndy Capwell