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Sukhothai Historical Park covers the ruins of Sukhothai, capital of the Sukhothai kingdom in the 13th and 14th centuries. The city walls form a rectangle about 2 km east-west by 1.6 km north-south. There are 193 ruins on 70 square kilometers of land. There is a gate in the centre of each wall. Inside are the remains of the royal palace and twenty-six temples, the largest being Wat Mahathat. The park is maintained by the Fine Arts Department of Thailand with help from UNESCO, which has declared it a World Heritage Site.