Guide to camping in Ontario - Database srearch engine of parks and campgrounds in Ontario. (Database has over 4,000 parks and campgrounds listed in Canada.) - http://www.campsource.ca/on/
Wilderness Adventurers of Ontario - An outdoors club involved in canoeing, camping, hiking, kayaking, and cross-country skiing. - http://www.wildernessadventurers.com/
Ontario Private Campground Association - OPCA has a searchable database of campgrounds, camping tips, links and other useful resources. - http://www.campgrounds.org/
Ontarioguide - Camping - A guide with links, to the most popular camping sites in Ontario. - http://ontarioguide.com/camping/