Grand Teton Park, Wyoming. First light illuminates Mount Moran in Grand Teton National Park, Wyoming as the calm waters of Leigh Lake create a perfect reflection. Leigh Lake was created when a large glacier flowed down Leigh Canyon during the Pleistocene epoch. As it deposited piles of rock and debris at its foot, the resulting terminal moraine blocked the flow of the stream and formed this lake. The much-larger Jackson Lake is located just to the north over the old lateral moraine.