The Kumano Kodō (熊野古道) is a series of ancient pilgrimage routes that crisscross the Kii Peninsula, the largest peninsula of Japan. These mountainous trails are used by pilgrims to the "Kumano Sanzan" (熊野三山) - the Three Grand Shrines of Kumano: Kumano Hongū Taisha (熊野本宮大社), Kumano Nachi Taisha (熊野那智大社) and Kumano Hayatama Taisha (熊野速玉大社). These three shrines are the holiest sites of the ancient syncretic Kumano religion. It has been visited by pilgrims seeking healing and salvation as a site of religious significance for over a thousand years. People with backgrounds from peasants to emperors would visit the region while guided by Shugendō monks. In July 2004, some of the roads of the Kumano Kodō and the shrines of the Kumano Sanzan, along with Koyasan and Yoshino and Ōmine, were registered as World Heritage sites together as the "Sacred Sites and Pilgrimage Routes in the Kii Mountain Range".