The ancient prehistoric civilization flourished in the western part of Thailand dates back to several tens of thousand years. From Kanchanaburi province especially in the basin of the two branches of the Kwai Yai and Noi rivers, many archaeological objects have been discovered.
One of the most important sites found in the Kwai Noi River basin is an ancient city site named Muang Sing. The important discoveries made near the ancient city remains include prehistoric human skeletons together with metal tools, vessels and ornaments; brick bases of the Dvaravati period architecture; and the laterite ruins of the13th century.