Kainan is a city located in Wakayama Prefecture, Japan. As of 31 October 2021, the city had an estimated population of 48,811 in 22129 households and a population density of 110 persons per km². The total area of the city is 101.06 square kilometres (39.02 sq mi)

Wakayama Prefecture is a prefecture of Japan located in the Kansai region of Honshu. Wakayama Prefecture has a population of 944,320 and has a geographic area of 4,724 square kilometres (1,824 sq mi). Wakayama Prefecture borders Osaka Prefecture to the north, and Mie Prefecture and Nara Prefecture to the northeast.