Astrolabe Lake (formerly Green Lake) is a lake in the township of Whitewater Region, Renfrew County, Ontario, Canada. Astrolabe Lake is where, in 1867, Edward Lee, a local farmboy, found Samuel Champlain's long lost astrolabe; a plaque now stands near the lake to commemorate this. The lake is a meeting point for the back end of both the local golf course, Oakes of Cobden, and the Logos Land waterpark.