Phra That Ku Chan is an important archaeological site in Yasothon Province that reflects the development of Buddhism in the lower Chi River basin. It is believed to be a stupa built to enshrine sacred Buddha relics according to Theravada Buddhist beliefs, blended with influences from Lan Xang culture and ancient Khmer civilization.According to local legend, Phra That Ku Chan may have been constructed around the same period as Phra That Phanom and was once part of an ancient settlement network that flourished in religion and habitation across the central Isan region. A key piece of evidence is the discovery of numerous sandstone boundary stones (bai sema) around the area, which were traditionally used to define sacred monastic boundaries in ancient times.

The stupa features a Lan Xang-style square-based structure that gradually tapers upward to a golden umbrella finial, symbolizing the Buddhist cosmological concept of Mount Meru. It is surrounded by a two-layer boundary wall that separates the inner and outer sacred areas, emphasizing the sanctity of the ritual space.Within the area, sandstone boundary stones engraved with ancient Khmer script have been found, reflecting historical Khmer cultural influence and confirming the antiquity of the settlement. Scholars believe these boundary stones are several hundred years old and were used in defining ordination hall boundaries for religious ceremonies.

In addition, the temple houses a local museum displaying archaeological artifacts such as sandstone Buddha images, ancient tools, and boundary stones excavated from the site, serving as a learning center for history and archaeology in the community.In terms of belief, Phra That Ku Chan is regarded as a spiritual center for local villagers, who believe that worshiping the stupa brings prosperity and good fortune. A major annual merit-making ceremony is held during Makha Bucha Day, featuring ritual bathing of the stupa that has been preserved for generations.Today, Phra That Ku Chan is not only a religious site but also a cultural, educational, and historical tourism center that helps preserve local identity and supports the community economy of Kham Khuean Kaeo District.