Bo Lek Nam Phi is the source of the best quality steel which was used to fashion swords and weapons in the past. Today, there are still two "wells" in existence. Ores from these two sources are believed to have been used to make swords for kings only. This ancient site can be reached by going for a distance of 42 kilometres to Thong Saen Khan district and continue for another 14 kilometres on Highway 1245.