Big Island 31D is a First Nations reserve on Big Island in Lake of the Woods, northwestern Ontario, Canada. It is one of the reserves of the Anishnaabeg of Naongashiing.

Big Island 31D
Big Island Indian Reserve No. 31D
Big Island 31D is located in Ontario
Big Island 31D
Big Island 31D
Coordinates: 49°07′N 94°38′W / 49.117°N 94.633°W / 49.117; -94.633
Country Canada
Province Ontario
DistrictRainy River
First NationNaongashiing
Area
 • Land3.70 km2 (1.43 sq mi)
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