Sakai is a city located in Fukui Prefecture, Japan. As of 10 May 2018, the city had an estimated population of 92,210 in 31,509 households and a population density of 550 persons per km2. The total area of the city was 209.67 square kilometres (80.95 sq mi).

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.