Kunisaki is a small coastal city situated in the Ōita Prefecture on the island of Kyushu, Japan. The municipality covers a total area of 318.10 square kilometers (122.82 square miles).
As of November 30, 2023, the city had an estimated population of 25,721 residents living in 13,082 households. The population density of the area is recorded at 81 persons per square kilometer.