01 / River source
The Tsurumi River risesin one of Machida's yato valleys.
The Ministry of Land, Infrastructure, Transport and Tourism records that the Tsurumi River rises in the Tanaka valley (about 170 m high), one of a group of yato valleys in Kami-Oyamada, Machida. It is a Class A river with a 43 km main channel and a 235 km² basin; the city calls the Oyamada area its uppermost headwaters.
- Source: the Tanaka valley (about 170 m; Ministry)
- Main channel 43 km, basin 235 km²
- Oyamada is the uppermost headwaters (city)


