I think 11,000 sq km is probably from Split Lake to York Landing, Gillam, Sundance and part of the Nelson River, plus the train tracks from Gillam to Churchill and York Landing. There's also the ferry from Split Lake to York Landing.
area = 11,000 square kilometres
area = length x width
111.025 = 105 x 105
a square with sides of 105 km makes 11,000 sq km
it's probably more of a rectangle with spots at Churchill and the Hudson Bay.
The red dot represents Gillam, the car and the bodies. Ignore the light blue route.
View attachment 197640