Mount Ikoma, Mountain summit at Osaka-Nara border, Japan

Mount Ikoma is a 642-meter peak on the border of Osaka and Nara prefectures, the main summit of the Ikoma Mountains. Its flat crest carries several thin transmission masts, and the slopes are covered with evergreen oak and shii trees rather than beech. The summit holds Ikoma Sanjo Amusement Park, while Hozan-ji temple and many small religious facilities stand on the mountainside.

Mount Ikoma appears in the Nihon Shoki, which recounts a battle between Kamuyamato Iwarebiko and Nagasunehiko at its foot. Ikoma Jinja, the shrine to the mountain's deity, has stood at the eastern foot since the 5th century. From 1941 to 1972 the Kyoto Imperial University Ikoma Observatory operated near the summit, mainly for solar observation.

Hozan-ji, on the mountain's flank, is a centre of this-worldly worship, surrounded by waterfalls used for ascetic practice and by small shrines and halls of many religious groups, some unregistered, so their number is not known. At the Nara foot stands Ikoma Shrine, dedicated to the mountain's deity; at the Osaka foot are Ishikiri Tsurugiya Shrine, called "Ishikiri-san", and Hiraoka Shrine, known as Moto-Kasuga.

The Ikoma Cable Line runs from Torii-mae Station at the foot to Ikoma Sanjo Station near the summit, where the amusement park and TV towers stand. Hikers can also start from Kintetsu Nara Line stations such as Ikoma, Ishikiri, Hiraoka and Nukata, or drive up the Shigi-Ikoma Skyline. The Osaka side is steep, the Nara side gentler.

The summit's flat crest carries a row of broadcast masts serving Kansai and Nara; the amusement park opened on the same mountaintop. From 1941 to 1972 the Kyoto Imperial University Ikoma Observatory also stood near the peak, used mainly for solar observation.