The present-day temple area is considered a “layered sacred site” overlapping with the original ancient boundary of the Buddhist ordination precinct. Its most significant feature is the discovery of numerous sandstone boundary stones (sema), which are crucial archaeological evidence for studying Buddhism during the Dvaravati period. These stones were found throughout the surrounding area and have been collected and preserved through collaboration between local communities and the Fine Arts Department. The sema stones come in various forms, including upright slabs and carved stone panels, mostly made of locally sourced sandstone. Their defining characteristic is highly detailed bas-relief carvings depicting scenes from the life of the Buddha, Jataka tales, and symbolic Buddhist motifs that blend local beliefs with ancient Indian cosmological concepts.

One of the most important carvings depicts the Buddha’s teaching episode involving Yasodhara (Princess Pimpa), showcasing the remarkable craftsmanship of ancient artisans in terms of proportion, movement, and emotional expression. Despite their antiquity, the carvings remain vivid and narratively expressive. In addition, the arrangement of the sema stones around the modern ordination hall serves not only as archaeological display but also as a religious restoration of the traditional Buddhist boundary (Sima). This creates a dual function as both a sacred religious space and an open-air museum.From an archaeological perspective, Fa Daet Song Yang is a key site that provides evidence for the early spread of Theravada Buddhism in northeastern Thailand. It also reflects the broader Dvaravati cultural network connected to central Thailand and the Mekong region. As a result, Wat Si Bun Rueang is not merely a local temple but an important regional heritage learning site.