Yamanouchi is a town located in Shimotakai District in Nagano Prefecture, Japan. As of 1 April 2019, the town had an estimated population of 12,403 in 5020 households, and a population density of 47 persons per km2. The total area of the town is 265.90 square kilometres. Yamanouchi, located in the Japanese Alps, includes Shiga Highlands, one of the largest ski resorts in Japan.