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Formerly Called Green Lake, 'Astrolabe Lake' is located in the Whitewater Region of Renfrew County in 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 stands as a meeting point for the back end of both the local golf course, Oakes of Cobden, and the Logos Land waterpark. The lake drains into Buttermilk Creek which flows into Muskrat River and on to Muskrat Lake.