Kōchi Prefecture comprises the southwestern part of the island of Shikoku, facing the Pacific Ocean. It is the largest but least populous of Shikoku's four prefectures. Most of the province is mountainous, and in only a few areas such as around Kōchi and Nakamura is there a coastal plain. Kōchi is famous for its many rivers. Inamura-yama in Tosa-cho is the highest peak in Kochi prefecture with an altitude of 1,506 meters above sea level.