Built in October 1973, Soyang Dam is Asia's largest and the world's fourth largest rock-fill dam. It stands 123m high and 530m long, and can generate 200,000kW-h of electricity. It serves multiple purposes including flood control, hydroelectric power generation, flood control, irrigation, and fishing. It holds 29 million ㎥ of water, which has become Soyangho Lake, Korea's largest man-made lake. Spanning a large area that borders the Gangwon-do cities and districts of Chuncheon, Hongcheon, Yanggu and Inje, the lake is often referred to as an "inland sea". Passenger ships bound for Yanggu and Inje run along the 60㎞-long water route that leads to Seoraksan Mountain.