Taiwan (i/ˈtaɪˈwɑːn/ TY-WAHN Chinese: 臺灣 or 台灣; pinyin: Táiwān; see below), officially the Republic of China (ROC; Chinese: 中華民國; pinyin: Zhōnghuá Mínguó), is a state in East Asia. Originally based in mainland China, the Republic of China now governs the island of Taiwan (formerly known as "Formosa"), which makes up over 99% of its territory, as well as Penghu, Kinmen, Matsu, and other minor islands. Neighboring states include the People's Republic of China to the west, Japan to the east and northeast, and the Philippines to the south. Taipei is the political capital as well as economic and cultural centre in Taiwan. New Taipei is the most populous city.
Yilan County is a county in Northeastern Taiwan. Its name comes from the aboriginal Kavalan tribe. Yilan is officially administered as a county of Taiwan.