Phrathat Nong Khai

Phrathat Nong Khai, also known as Phra That Klang Nam, is a ruined ancient Buddhist stupa submerged in the Mekong River at Mueang Nong Khai, Nong Khai Province, northeastern Thailand. Originally built on land, riverbank erosion caused it to collapse into the river in the 19th century. The brick chedi is visible above water during the dry season and is revered as a sacred relic site, viewed from the riverbank near Wat Lam Duan.

Visitors can expect to view a historic brick chedi situated in the middle of the Mekong River from the riverbank promenade near Wat Lam Duan. The stupa is partially submerged for most of the year and becomes more visible during the dry season when water levels drop. The site is an open riverside viewpoint with views across the Mekong to Laos, small shrine areas on the bank for merit-making, and opportunities for photography and short boat trips to see the chedi up close.

Phra That Nong Khai is believed to have been originally constructed between the 12th and 15th centuries on the bank of the Mekong River. Due to riverbank erosion, the chedi collapsed and subsided into the Mekong River in 1847. The remaining brick structure now lies in the river channel and is regarded as an important archaeological and historical landmark of the Nong Khai region.

The stupa is revered by local Buddhists as a sacred chedi believed to enshrine relics of the Buddha. It remains an important object of veneration and merit-making for residents of Nong Khai and visitors, with a replica chedi and shrine on the riverbank for worship when the original is submerged.