The Bay of Fundy (French: Baie de Fundy) is a bay between the Canadian provinces of New Brunswick and Nova Scotia, with a small portion touching the U.S. state of Maine. It is an arm of the Gulf of Maine. Its tidal range is the highest in the world.
The bay was named Bakudabakek by the indigenous Mi'kmaq and Passamaquoddy groups, meaning "open way". The Wolastoqiyik peoples named it Wekwabegituk, meaning "waves at the head of the bay". The name "Fundy" has been speculated to have derived from the French word fendu ("split") or Fond de la Baie ("head of the bay"). Some individuals have disputed this, including William Francis Ganong, who suggested that the name likely derived from Portuguese origin instead, specifically regarding João Álvares Fagundes, who may have referred to the bay as Gram Baya ("Great Bay") and nearby waters as Rio Fondo ("deep river").