Awesome. At the very bottom below P. Williams I see "M92" (maybe W92?) just to the left of the longitude line, for whatever that's worth.
Yes, 92nd meridian west! Aka Nunavut. So it must be where the Arctic Circle crosses the meridian, which is here. I think that the piece of shore topleft on the N sorta matches the Queen Maud huge-ass green bird area. edit1: Turns out that Nunavut has only been called that way since 1991, before it was a part of the Northwest Territories. So it probably still is Northwest Territories that the capital letters denote. edit2: I think we have a match! cue dramatic CSI scene confronting the suspect. The shorelines match roughly, the Arctic cicle neatly defines the border of the bird area and the bit of water in the bottom right matches too. This is fun!
I think we're all a little hesitant to crack jokes for fear of being reddit.