Phra That Cho Hae is an octagonal-shaped stupa with indented corners in the Chiang Saen (Lanna) style, covered with "Thong Jang Ko" (gold-plated copper). Standing approximately 33 meters tall with an 11-meter wide base, it enshrines a holy hair relic and the left elbow bone of Lord Buddha. According to legend, it was built during the Sukhothai period by Khun Luang Phon (under King Li Thai), and named "Cho Hae" after the silk cloth used to wrap the relics. It is the most revered stupa in Phrae and is the official pilgrimage site for those born in the Year of the Tiger. Devotees believe that worshipping this stupa brings prosperity, peace, and protection from all dangers.