Mount Kōya is a sacred mountain located in Wakayama Prefecture, Japan. It is the center of the Shingon school of Buddhism, founded by the monk Kōbō Daishi in the 9th century. The mountain is home to over 100 temples, with Kongōbu-ji being the main temple. The area is known for its serene atmosphere and beautiful natural surroundings. Visitors can explore the lush forests, ancient trees, and the famous Okunoin cemetery, which is the final resting place of Kōbō Daishi. Mount Kōya is a UNESCO World Heritage Site, attracting pilgrims and tourists alike.