Heron Bay is a small community southeast of Marathon. You’ll have to detour south on road 627 off the TransCanada, but it is only a ten minute drive.
I didn’t venture onto 627 – it was raining and I had been driving for hours and had to get to Timmins by nightfall. Therefore, please send me any info or pictures you might have. Email me at info (at) highway11 (dot) ca.