Actually, my forehead has morphed into a fivehead. 
If it has ice water mansions to do it in.
Georgian Bay would certainly be considered a separate body of water by a boater, because it’s so geographically different from its parent lake. Georgian Bay and the North Channel are some of the most beautiful cruising areas in the world, and include the spectacular white quartzite mountains of the La Cloche Range. Killarney Provincial Park is there, a protected wilderness area of spectacular beauty that inspired the paintings of the Group of Seven. Whereas Lake Huron, except for its northern shore where it connects with Georgian Bay, is geographically fairly boring.
From the labels, that appears to be three lakes: South Lake, North Lake, and North South Lake.
And they should be East Lake and West Lake, really! Didn’t they have compasses back then???
Beautiful campground, though.
Georgian Bay also has Tinnerman Canoe Base (actually on the French River), a great Boy Scout camp.
Are Europe and Asia one continent or two? It should be the same answer. You’d think so anyway, but I bet there’s people out there who say one continent and two lakes. And perhaps some people think it’s the other way around.
If they count Lake St Clair as a great lake, then Lake Nipigon wants to be one too.
As Ken Jennings noted in his very entertaining book Brainiac. He (or was it a friend of his?) once won a trivia contest just that way.
If you look at satellite view, those are really, really two lakes. I have no idea why Google Maps shows the connection between them as being so broad. Maybe it floods?
The satellite view I’m seeing has the same shores as the maps view. But maybe it does change significantly with the water level (thus accounting for the confusing nomenclature), and maybe different zoom levels were taken when the levels were different (thus accounting for you and I seeing different things).
Except for the whole eastern half that bends and goes east-northeast. The inflection point has the eastern third of L. Erie, then Niagara, L. Ontario, St. Lawrence going east-northeast. I ought to know. That’s exactly where I was born and raised. The opening of the St. Lawrence Seaway was regionally a really big deal about the time I was born. But we were focused on the western half of the GL.
dtilque is right about Lake Nipigon, geologically. Nipigon represents an aulacogen, a failed continental rift. It took a certain amount of rifting to form the GL basins. The glaciers enlarged the lake basins by scraping them over, but glaciers couldn’t carve out that much rock. The rifting that formed the basins themselves was much older. The western end of it trailed up past L. Superior as far as L. Nipigon. Past Nipigon is the point where, if it ripped, the whole North American continent could maybe rip apart. But that is the point where North America, held down securely by the great Canadian Shield, held fast.
Speaking of the St. Lawrence Seaway: Bob Hope was from Cleveland, and he’s going “Thanks… for the zebra mussels… Not!”
Also, not that about half of “North Lake” looks like the same kind of surface as the connector. There’s good chance that the pale green you are seeing is algae or water plants growing on top of the lake.