Sai River (Nagano)

The Sai River (Sai-gawa), is a river in Japan, located in northeastern Honshu and flowing generally northeast through Nagano Prefecture. It is a tributary of Shinano River, the longest river in Japan. The Sai River is 153 km long with a watershed of 2773 sq km, and has its source at the confluence of rivers Azusa and Narai in Matsumoto city.

Flows through: Japan.

River data from Wikidata (CC0); lengths normalised to a common unit.