is a Japanese sect of Shingon Buddhism. Headquartered on Mount Kà Âya in Wakayama Prefecture, it is also the oldest and largest of the eighteen Shingon sects in Japan. The main temple is Kongà Âbu-ji. , there are nearly 4,000 affiliated Kà Âyasan Shingon-shà « temples in and beyond Japan. There are missions in North America and Hawai'i specifically that function as non-profit arms of the section.