This sign explains the history of "Phu Nam Lod," a sacred well located near Phra That Choeng Chum in Sakon Nakhon province. Its origin is attributed to an underground spring in the Phu Phan mountain range, flowing through the city and emerging here before emptying at Sa Phang Thong. The water is believed to possess spiritual power, suitable for making holy water and healing illnesses. Currently, it is being restored to serve as a cultural heritage site.