Derwent River is a river in Tasmania, Australia. It flows 120 miles (195 kilometers) from Lake St. Clair to Storm Bay. Hobart lies at the mouth of the river. The main tributaries of the Derwent River are the Ouse, Clyde, and Styx. The valley through which the Derwent flows is extremely fertile. Farmers there grow hops, apples, pears, and potatoes. The valley is also important for its timber, fishing, and dairy products. Hydroelectric power stations operate at Tarraleah and Tungatinah. The river mouth provides an excellent deepwater harbor for the city of Hobart.
