Kaizu is a city located in Gifu, Japan. As of 1 April 2018, the city had an estimated population of 34,960, and a population density of 310 persons per km2, in 12,167 households. The total area of the city was 112.03 square kilometres (43.26 sq mi). Most of the city is located at sea level and is well known for levees surrounding the area.

Gifu Prefecture is a prefecture of Japan located in the Chūbu region of Honshu. Gifu Prefecture has a population of 1,991,390 and has a geographic area of 10,621 square kilometres (4,101 sq mi). Gifu Prefecture borders Toyama Prefecture to the north; Ishikawa Prefecture to the northwest, Fukui Prefecture and Shiga Prefecture to the west, Mie Prefecture to the southwest, Aichi Prefecture to the south, and Nagano Prefecture to the east.