the valley sprawls through Cedar and Kedumba Valley down to Coxs River and Lake Burragorang, the lake that was created when Warragamba Dam was built. There is a prohibited area around the river and lake to protect Sydney's water supply. Around this area there is a high-tension power line that crosses the valley from east to west; it is followed by a series of service roads that provide access to the powerline and to the area, although much of it is in the prohibited area. These service roads make it possible to do a trek taking in the whole valley, but it is necessary to get permission from Sydney Water to go through the prohibited area. The Katoomba and Jamison topographic maps are essential for any of these walks. The northern escarpment is deeply serrated, having been carved up by watercourses over millions of years. Watercourses include Jamison Creek, Valley of the Waters Creek, Gordons Creek, Leura Falls Creek, Kedumba River and Causeway Creek. There are also numerous waterfalls, including Wentworth Falls, Empress Falls, Vera Falls, Gordon Falls, Leura Falls and Katoomba Falls. The valley is densely forested, with eucalypt forest over most of its expanse and occasional pockets of semi-rainforest in gullies, where water is concentrated. Activities The Jamison Valley is commonly visited by bushwalkers and campers. There is a network of tracks across the northern escarpment, including Darwin's Walk, the tracks in the Valley of the Waters and old, neglected tracks that Blue Mountains bushwalkers have been trying to restore for years. Tracks are also found along the cliffs near Leura and Katoomba, as well as tracks like the Federal Pass, located at the foot of the cliffs. A track also goes west around to the Ruined Castle and Mount Solitary. The track continues across the mountain but is patchy and suitable only for experienced walkers. It is possible to then go up to Kings Tableland and into Wentworth Falls, making a trek of at least three days. The tracks closer to the escarpment are suitable for one-day walks. Mount Solitary is used mostly for camping trips, although some walkers have been known to make one-day walks to the mountain. In this part of the valley there was formerly a sewage treatment plant, not far below the northern escarpment. It was serviced by a dirt road that went up to Kings Tableland and thence to Wentworth Falls town.