Highlight • Lake
McGinnis Lake
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Tips
Will
March 6, 2026
McGinnis Lake in Petroglyphs Provincial Park is one of the few meromictic lakes in southern Ontario, meaning its deeper water layers never mix with the surface. Because the bottom layer stays oxygen-free, the lake preserves undisturbed sediment layers that scientists use for studies. The lake’s stunning jade-green colour comes partly from calcium carbonate in the surrounding limestone, which often settles as marl along the shoreline.
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Nearby routes
Best routes near McGinnis Lake
1.00km
00:16
10m
10m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
Easy
5
hikers
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
Moderate
5
hikers
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
Moderate
Details
Informations
Elevation 250 m