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One of the most dramatic demonstrations of the power of the tides is found in the Western Passage of the Passamaquoddy Bay towards the mouth of the Bay of Fundy. “Old Sow” is the largest whirlpool in the western hemisphere, the second largest in the world - second only to the Maelstrom Whirlpool of Norway. Located between Deer Island and Indian Island, this natural wonder can be seen from the shores of Eastport, Maine. It is called “Old Sow” because of the sounds that are heard from the churning waters. This powerful whirlpool is formed when the rising tide passes both sides of Indian Island, takes a sharp right turn around the southern tip of Deer Island to flood the Western Passage. A current of over 6 knots (11 km/hr or 6.9 mi/hr) has been experienced off Deer Island Point. In addition to the waters pressing through the narrow straight, the waters are forced along the peaks and valleys of the ocean floor – a trench as deep as 122 meters (400 feet), followed by a reduction in water depth to 36 meters (119 feet) and again followed by a depth of over 107 meters (350 feet). The current of inflowing tributaries within the Passamaquoddy Bay add to the already busy waters. 
Old Sow is reported to be most active about 3 hours before high tide. This activity continues for about two hours and takes the form of a collection of small gyres, troughs, spouts and holes and on the rare occasion will form one large funnel. This area, which has been reported to be as wide as 76 meters (250 feet) in diameter, can best be described as turbulent water. However, during spring tides (high water tide caused by a full or new moon) combined with high winds or a tidal surge will increase Old Sow’s activity causing more intense funnels and formations. Additional Reading: http://www.oldsowwhirlpool.com
It'll Thrill Ya, It'll Kill Ya - Wired.com
In the Eye of the Whirlpool - Smithsonian Journeys
Close Encounters With the Old Sow - Smithsonian Journeys
Down the Drain: Diving the hemisphere's largest tidal whirlpool - Scuba Diving Magazine
Other Whirlpools of the World: http://www.masha.curvedspaces.com/maelstrom.html
http://www.gemini-crinan.co.uk/corryvreckan.html
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