The Tamagawa River is a major river in Japan, flowing through the Tokyo and Kanagawa prefectures. It stretches approximately 138 kilometers and is known for its scenic beauty and recreational opportunities. The river originates from the Tama Hills and eventually merges with the Tokyo Bay. The river plays a vital role in the local ecosystem and provides water for agriculture and urban areas. It is also a popular spot for outdoor activities such as cycling, jogging, and fishing. The Tamagawa Aqueduct is an important structure that helps manage water flow and supply in the region.