Wikipedia
Singhanavati
The Singhanavati Kingdom was based along the river named Kok, in the Chiangrai Basin in northern Thailand. The ancient Lanna society of northern Thailand is considered more progressive than many other societies in other regions of the same period, in that the Lanna people recorded their history and social development. Records concerning cities in the Chiangmai and Chiangrai Basin have proved well-grounded. A large number of stone tools were excavated in this area. Settlements in this region are supported by Thai north chronicle and the record of Yonok-nagabundhu, which is about people migrating to settle in this region.