Kōyasan, or 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 Kūkai in the 9th century. The area is home to numerous temples, including the famous Okunoin, which houses the mausoleum of Kūkai. The mountain is also known for its stunning natural beauty and serene atmosphere, attracting both pilgrims and tourists. Visitors can explore the lush forests, ancient temples, and the picturesque Kōyasan Cemetery, which features thousands of stone lanterns and memorials, creating a peaceful and reflective environment.