my family rented a cabin frequently near Perth and I am sure we passed a Rideau lake up there somewhere....lovely area....my husband and I took a brief camping trip way up in the provincial park north of Ottawa....all I know is it was at least 17 miles of dirt road.
Good memory! Yes, the Rideau Lakes Townships are nearly two dozen villages in an area just south of Perth, which is southwest of Ottawa. The area sees a lot of summer tourism both for the quaintness of the small towns and the chain of lakes.