Lake Travis, approximately 20 miles northwest of Austin, is one of seven reservoirs, known as the Highland Lakes, formed by dams along the lower Colorado River (Lady Bird Lake in Austin is another). Travis is the largest and, despite its depth, has some of the clearest water among these reservoirs. Because of its size, it serves as a source of water and hydro-electric power, and also offers most every type of recreation under the sun, including swimming and water sports—scuba diving, wake-boarding, parasailing, windsurfing—as well as boating: sail and motor boats, plus large, excursion cruise and pontoon vessels. It is popular with families and groups for wide-ranging activities along its shoreline parks: hiking, biking, zip-lines, and golf, as well as scenic spots for picnics and camping. In addition, the lake is also notable for sports fishing and, in particular, its stocks of bass.