It was located in the Tōsandō region of central Honshu. According to the old history book Shoku Nihongi, it was established on June 26 of 721 and abolished on March 3 of 731 (old Japanese calendar's date). Neither the location of the capital nor the exact border with Shinano is known.
- Nussbaum, Louis-Frédéric and Käthe Roth. (2005). Japan encyclopedia. Cambridge: Harvard University Press. 10-ISBN 0-674-01753-6; 13-ISBN 978-0-674-01753-5; OCLC 58053128
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