Yoho National Park, Canada. The President Range towers above aquamarine-colored Emerald Lake in the British Columbia Mountains of Yoho National Park. The waters of this lake take on a cerulean hue in summer as the meltwater from glaciers flows into the lake with its burden of ground-up glacial silt. Suspended in the water of the lake, this milky solution absorbs the light at the short end of the visible-light spectrum causing the water to appear blue green. Located just west of the Continental Divide and Banff National Park, Yoho Park attracts visitors from around the world. The valleys of Yoho were filled with enormous glaciers at the maximum extent of the ice sheets at the height of the Pleistocene Epoch about 20,000 years ago.