Fort Provintia or Providentia, also known as Chihkan Tower (Chinese: 赤嵌樓; pinyin: Chìkǎnlóu; Pe̍h-ōe-jī: Chhiah-khám-lâu), was a Dutch outpost on Formosa at a site now located in West Central District, Tainan, Taiwan. It was built in 1653 during the Dutch colonization of Taiwan. The Dutch, intending to strengthen their standing, sited the fort at Sakam, about 2 miles (3.2 km) due east from modern-day Anping. During the Siege of Fort Zeelandia (1662), the fort was surrendered to Koxinga, but was later destroyed by a rebellion and earthquakes in the 18th century. It was rebuilt afterwards in the 19th century under Qing rule.