The lake elevation is approximately above mean sea level. Both ends of the lake are fairly shallow, with depth ranges of to . The lake bottom takes a dramatic drop in Canada, starting opposite Mont Owl's Head and continuing that way north to Gibraltar Point, where it starts to climb back to the shallows of the north end. Its maximum recorded depth of is located in Canada, opposite Jewett Point (at approximately ). The lake is the third deepest in Vermont. It contains 21 islands. Province Island, the largest, is divided by the international border.