St. Mary Lake is on the east side of Glacier National Park along The Going-to-the-Sun Road. This lake is 10 miles long but not as wide as McDonald Lake. You'll want to stop at the turnouts at the end of the lake for a view of 100-foot Virginia Falls across the valley. From the Virginia Falls Turnout or Sun Point you can take some short hikes. One is a fork that leads to Sunrift Gorge where a steep, paved path leads to an overlook with windswept pines and views of Baring Creek cascading over slickrock. Another trail continues around to the end of St. Mary Lake and leads to St. Mary and Virginia Falls. There is an excellent view of St. Mary Lake as the trail rounds the lower end of the lake over a bluff. It then takes you to St. Mary Falls and then over a bridge at the base of Virginia Falls.