Bras d'Or Lake (Mi'kmawi'simk: Pitupaq) is an irregular estuary in the centre of Cape Breton Island in Nova Scotia, Canada. It has a connection to the open sea, and is tidal. It also has inflows of fresh water from rivers, making the brackish water a very productive natural habitat. It was designated the Bras d'Or Lake Biosphere Reserve (now Bras d'Or Lake Biosphere Region) by UNESCO in 2011.
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Bras d'Or Lake in the context of Cape Breton Island
Cape Breton Island (French: île du Cap-Breton, formerly île Royale; Scottish Gaelic: Ceap Breatainn or Eilean Cheap Bhreatainn; Mi'kmaq: Unama'ki) is a rugged and irregularly shaped island on the Atlantic coast of North America and part of the province of Nova Scotia, Canada.
The 10,311 km (3,981 sq mi) island accounts for 18.7% of Nova Scotia's total area. Although the island is physically separated from the Nova Scotia peninsula by the Strait of Canso, the 1,385 m (4,544 ft) long Canso Causeway connects it to mainland Nova Scotia. The island is east-northeast of the mainland with its northern and western coasts fronting on the Gulf of Saint Lawrence with its western coast forming the eastern limits of the Northumberland Strait. The eastern and southern coasts front the Atlantic Ocean with its eastern coast also forming the western limits of the Cabot Strait. Its landmass slopes upward from south to north, culminating in the highlands of its northern cape. A large body of saltwater, the Bras d'Or ("Golden Arm" in French), dominates the island's centre.