Ontario is VERY large, and Nishnawbe Aski is just the name of tribal police (they are scattered throughout Ontario). It would have been nice if the article gave us a hint as to what part of Ontario.
The couple, who live in Fort Severn First Nation...
Fort Severn is a Swampy Cree First Nation on the southern shores of Hudson Bay, the northernmost community in Ontario, and a place where polar bears are often spotted...
https://en.wikipedia.org/wiki/Fort_Severn_First_Nation
Somewhere way up north, around the Hudson Bay, I believe.