|Ocean/sea sources||Nansen Sound|
|Basin countries||Nunavut, Canada|
Tanquary Fiord or Greely Fiord is a fjord on the north coast of the Canadian Arctic Archipelago's Ellesmere Island, Nunavut, Canada. It is located in the Quttinirpaaq National Park and extends 30 mi (48 km) in a north-westerly direction.
Radiocarbon dating methods suggest that between 10,000 and 4,100 BP, deglaciation occurred, followed by a period of glacial readvance and the formation of ice shelves until 2,400 BP. Until 1,400 BP, a period of glacial retreat occurred, and since then glacial readvance and nearby ice rises have marked the area.
The head of the Tanquary Fiord is the convergence point of four river valleys, three of which end in a floodplain and one in a river delta. Carbon dating findings show that the fjord was free of glacial ice approximately 6,500 years ago. In the past 40 years, the terminal points of side glaciers have receded.
In 1963, the Defence Research Board began 'Operation Tanquary' in the area, with a focus on oceanography. The operation concluded in 1972. As the fjord is in a remote location, there is little human habitation. A Warden Station is staffed by Parks Canada during the summer months, and Tanquary Fiord Airport is located nearby. It is possible to reach the area via charter aircraft, or increasingly, via icebreaker cruise ships. In 1947, a meteorological station was installed at Eureka, about 175 km (109 mi) southwest of the fiord.
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