Mount Kōya (高野山, Kōya-san) is the common name of a huge temple settlement in Wakayama Prefecture to the south of Osaka. In the strict sense, Kōya-san is the so-called “mountain name” sangō (山号) of the Kongōbu-Temple (金剛峯寺, Kongōbu-ji), the ecclesiastical headquarters of the “Koyasan Shingon School”.^[1]

First settled in 819 by the monk Kūkai, Mt. Kōya is primarily known as the world headquarters of the Kōyasan Shingon sect of Japanese Buddhism. Located on an 800 m high plain amid eight peaks of the mountain (which was the reason this location was selected, in that the terrain is supposed to resemble a lotus plant), the original monastery has grown into the town of Kōya, featuring a university dedicated to religious studies and 120 sub-temples, many of which offer lodging to pilgrims.

Wikipedia