Inokashira Park was systematically prepared as Japan's first suburban park in 1913. The Inokashira Lake was the source of the Kanda water supply, the first water supply irrigated into the Edo area. Until the water supply reformation in 1898, the lake played an important part in providing water to the residents. It is said that the lake was named by the third Tokugawa Shogun, Ieyasu Tokugawa. The meaning is theorized to be either "the source of the water supply" or "a well that provides delicious water." A forest of Japanese Cedar trees cultivated at the source of the river provide lush scenery in the area. Although with the passing of time the type of trees and the feeling of the forest may have changed, and the area is considered less suburban at present, it is still a place for the relaxation and refreshment of the residents of Tokyo. The park is divided into four areas: Inokashira Lake and its surroundings, the Gotenyama area which has a grove of mixed trees and cultural nature garden, the western park area with sport facilities, and the Dai-ni Park located in the southeast portion of the western park.