Kalamalka Lake (aka "Kal Lake") is a large lake in the Interior Plateau of southern central British Columbia, east of Okanagan Lake and approximately 4 kilometers (2 mi) south of Vernon. The lake is named for the Okanagan (Okanogan U.S. spelling) Indian chief who occupied its northern shores, although many believe (incorrectly) that it means "lake of many colours" in the Okanagan language.
At different times of the year the colour of the lake can range from cyan to indigo, in different spots at the same time. The colour of the water is derived from light scattering, caused by the precipitation of calcite