Purdon Conservation Area, Protected natural area in Lanark County, Canada.

Purdon Conservation Area is a protected natural area of about 200 hectares in Lanark Highlands, Lanark County, Eastern Ontario, near the community of Lanark. It is operated by the Mississippi Valley Conservation Authority and holds a fen where Canada's largest native colony of showy lady slipper orchids grows. Boardwalks and trails lead visitors through the wetland.

Joe Purdon discovered several lady slipper orchids on this land in the 1930s and applied specific management methods to expand their population. His early conservation efforts established the foundation for protecting the area.

The area functions as a place where visitors encounter information about native orchid species and wetland ecology through interpretive signs along the pathways. People come to understand how these habitats support specialized plant life.

The site is open from dawn to dusk and sits north of Lanark Village on County Road 8 for easy access. Admission works through voluntary donations, giving visitors flexibility in how they support the area.

The area contains Canada's largest colony of showy lady slipper orchids, with over 16,000 plants thriving here. This rare concentration blooms between mid-June and early July each year.