The Si Satchanalai Historical Park is a historical park in Si Satchanalai district, Sukhothai Province, northern Thailand. In 1976 the restoration project was approved, and in July 1988 the park was officially opened. On December 12, 1991, it was declared a World Heritage site, together with the associated historic parks in Kamphaengphet and Sukhothai.
Si Satchanalai was the second-most important town of the Sukhothai kingdom. The ruins of its temples are now part of the Si Satchanalai historical park, which is part of UNESCO world heritage site of Sukhothai.Among the remains of the 19 monuments inside the city wall, highlights are the first three monuments from the entrance, Wat Chang Lom, Wat Chedi Chet Thaew and Wat Nang Phaya.Si Satchanalai, the other historical site, is only 55 kilometers from the town of Sukhothai. The location of an ancient community and covering over 2,000 rai of land, Si Satchanalai had the status of "Muang Luk Luang", as it was ruled by the son of a king. In 20th century, when Sukhothai was ruled by Ayutthaya, Si Satchanalai assumed the lower status of "Muang Phaya Mahanakorn" and was known as "Muang Sawankaloke".