Wang Lang, or the Rear Palace, is a defunct Ayutthaya-era palace, formerly located on the site now occupied by the Fine Arts Department (FAD) - Region 3, adjacent to Chedi Phra Sri Suriyothai, part of Wat Suan Luang. In the 20th century, the site was a liquor distillery. The Rear Palace was situated opposite Wat Kasattra on the east bank of the old Lopburi River, whose riverbed in the 19th century became the Chao Phraya River. The site lay within the city walls on the western side.