01 / Old barrier monument
The site of the Shirakawa Barrier, once forgotten,was identified by Sadanobu in 1800.

The whole hill, about 410 m high, is a designated historic site. The barrier is thought to date from the Nara to Heian periods, and its location is presumed to have been forgotten. Matsudaira Sadanobu surveyed and studied it, identified the present site, and raised a monument.
- National Historic Site (designated 1966)
- Monument raised in Kansei 12 (1800)
- The whole hill, about 410 m high, is designated

