What is the name of a large whirlpool located near Canada's Bay of Fundy?

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 tidal whirlpool in the Western Hemisphere. It is situated off the shores of Deer Island in New Brunswick, Canada. The name “Old Sow” is said to have been derived from the pig-like noise made by the whirlpool.

It is formed by an extreme tidal range where there is an exchange of water between the Bay of Fundy and Passamaquoddy Bay and is accelerated by the unusual seafloor topography in the area. The whirlpool forms in a region of about 76 metres (250 ft) in diameter.

The activities of Old Sow whirlpool are affected by the numerous currents and counter currents including tidal surges, storms, and strong winds. The whirlpool can be best viewed at Deer Point on Deer Island at the south end of the island or from Moose Island. Several other small whirlpools can also be seen in the area. Locals call the smaller whirlpools that surround the Old Sow as "piglets".