Maine is home to many awesome natural wonders, including one of the biggest whirlpools on earth. It's certainly not the colossal watery vortex that swallows up huge ships in sea stories, but it's still a cool sight. Old Sow Whirlpool is located between Deer Island, New Brunswick, Canada, and Moose Island, Eastport, Maine. It's the largest tidal whirlpool in the Western Hemisphere, and among the biggest in the world.