Wat Sa Si (Thai: วัดสระศรี) is a small temple close to Ramkhamhaeng Monument. Wat Sa Si is beautifully situated in the midst of Traphang-Trakuan lake northwest of Wat Mahathat. Due to its location, the temple is one of the most beautiful place in Sukhothai. The temple has a Lanka styled stupa. The vihara of Wat Sa Si is situated on the east side of the stupa. Further east lies the ordination hall on its own little island. Also a large number of smaller stupas, of which today only the foundations are visible. Due to the similarities in structure and similar Bai Sema landmarks, it is believed today that Wat Sa Si were built at the same time of Wat Tra Kuan and Wat Chana Songkhram.