Medicine Lake is the intriguing lake of mystery and Native legends, and the lake before Maligne Lake. Medicine Lake is drained by one of the largest under­ground river systems in North America. The water level of the lake varies from season to season. It disap­pears except for a few streams completely every fall. In the spring time the lake water reemerges. Natives once thought that “spirits” were respons­ible for the dramatic fluctu­ations in the placid waters. They called it Medicine Lake of course when the Lake reemerges the water looks a bit murky, like medicine in a bottle.