"Island," north end of Pen Lake, looking south
Spent a cold weekend here last fall! It's joined to the righthand shoreline by a sandy bushy isthmus. Boulders block the channel dead centre. Access the main part of the lake by going east of the real island (left side of photo).Edit: turns out there is a way through the boulders but you need to be practically on top of them to see it. Thanks to "scoutergriz" on the Algonquin Adventures forum for the info.