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Place
- Oilwell Bog, Puslinch Twp., mid-way between Guelph and Cambridge1
- Oldman River Watershed, 1 mile west of Avion Ridge, Castle River Valley1
- Oldman River Watershed; beside Lost Lake Trail, between Snowshoe Warden Cabin and Castle River Divide Junction, Waterton Lakes NP1
- On trail from Waterton Lakes to Alderson Lake1
- Ontario75
- Ootsa Lake1
- Ottawa3