Koujima is located about 150 m offshore of the city area of Kushima-shi. It is also called Sarushima(Monkey island) by another name. The island is a small island with a height of 113 m and a circumference of 3.5 Km and is a desert island. Although no one lives, about 100 Japanese monkeys live, and it is a precious place for ecological research. It is uninhabited. It is located on the beautiful Ishinba coast, which was also chosen as one of the 100 beaches of Japan, and a wide variety of shells.