Course
Its source is located in Mt. Kasadori in Koshu in Yamanashi Prefecture. From there, it flows eastward into mountainous western Tokyo, where the Ogōchi Dam forms Lake Okutama. From there, it takes the name Tama, and flows eastwards through Chichibu Tama Kai National Park towards Ōme, Tokyo.
From there flows southeast between Tama Hills and Musashino Terrace. At Hamura is the source of the historic Tamagawa Waterway built by the Tamagawa brothers in 1653 to supply water to Edo (present day Tokyo). Further downstream, the river forms the boundary between Tokyo and the city of Kawasaki in Kanagawa Prefecture. Its mouth on the heavily industrialised Tokyo Bay is next to Haneda Airport.
Read more about this topic: Tama River