Si Satchanalai Historical Park contains the ruins of the ancient town of Si Satchanalai, an important town in the Sukhothai Kingdom in the 13th and 14th century. The 45 km2 little visited park on the Yom river is set in a natural, forested area. Dozens of sites inside and outside of the old city walls have been excavated. A number of temples have been restored to their original glory.
Si Satchanalai, together with the Historical Parks of its sister cities Sukhothai and Kamphaeng Phet is a UNESCO World Heritage Site.
Si Satchanalai was a vassal town of Sukhothai, the capital of the empire located about 85 kilometers to the South.