Yellowstone NP, Wyoming 2012 - waynelr
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Yellowstone

West Thumb Geyser Basin overlooks Yellowstone Lake, the largest lake at high elevation in North America. The surface of the lake hints at what exists below. Recent surveys of the lake bottom have documented hot springs and hydrothermal vents just offshore in West Thumb. As you walk among the basin's superheated waters, you may wonder if the lake is warmer here than elsewhere. After all, the geyser basin pours an average of 3,100 gallons (11,733 liters) of hot water into the lake every day. But even here, the lake's average summer temperature is 45 degree Fahrenheit (7 degrees Celsius).