The Rankin River tributary is navigable from Sky Lake to Boat Lake where the river meanders through marshes that shelter osprey and Black tern nesting sites. River access is possible from three locations: The Red Bay Road runs west from Mar and crosses between Sky Lake and Isaac Lake that have some of the best bass and pike fishing in Ontario. A boat launch is located beside the bridge on County Road 13. Isaac Lake Nature Reserve has a picnic area, boat ramp and numerous nesting sanctuaries for waterfowl. It is located at the east shore of the lake on Isaac Lake Road.