Phra That Klang Nam is a stupa associated with the Mekong itself, remembered locally as a sacred structure lost to the river. A replica and riverside markers now help visitors understand the site, especially when the water level makes the original location hard to read.
It is a small stop, but a good one if you are walking or cycling Nong Khai's riverfront. The story connects Buddhist devotion with the Mekong's power to reshape banks, routes, and memory over time.