Spotted Lake is a saline endorheic alkali lake located northwest of Osoyoos in the eastern Similkameen Valley of British Columbia, Canada accessed via Highway 3.
Spotted Lake is richly concentrated with various minerals. It contains dense deposits of magnesium sulfate, calcium and sodium sulphates. It also contains high concentrations of eight other minerals and lower amounts of silver and titanium.
Most of the water in the lake evaporates over the summer, revealing colorful mineral deposits. Large “spots” on the lake appear and are colored according to the mineral composition and seasonal amount of precipitation.Magnesium sulfate, which crystallizes in the summer, is a major contributor to spot color. In the summer, remaining minerals in the lake harden to form natural “walkways” around and between the spots.