Ōno is a city located in Fukui Prefecture, Japan. As of 1 July 2018, the city had an estimated population of 33,640 in 11,747 households and the population density of 39 persons per km2. The total area of the city was 872.43 square kilometres (336.85 sq mi). The town is encircled by a ring of mountains and the only way in or out is via tunnels or mountain roads.

Fukui Prefecture is a prefecture of Japan located in the Chūbu region of Honshū. Fukui Prefecture has a population of 778,943 and has a geographic area of 4,190 km2. Fukui Prefecture borders Ishikawa Prefecture to the north, Gifu Prefecture to the east, Shiga Prefecture to the south, and Kyoto Prefecture to the southwest.