Lying on the skirt of Mt. Nantaisan, the Chuzenji Lake is located at an altitude of 1,269m, one of the highest locations of Japanese lakes. It is said that this lake was formed by an eruption of Mt. Nantaisan about 20,000 years ago. In the 19th and 20th centuries, villas owned by foreigners and embassies of oversea countries were built in this area and obtained popularity as an international summer resort. A hiking course runs along this 25km-around lake, and visitor can view azalea flowers in early summer, as well as colorful leaves in autumn.