Taiwan (Chinese: 臺灣 or 台灣; pinyin: Táiwān), officially the Republic of China (ROC; Chinese: 中華民國; pinyin: Zhōnghuá Mínguó), is a sovereign state in East Asia. The Republic of China, originally based in mainland China, now governs the island of Taiwan, 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 seat of the central government. New Taipei City, encompassing the metropolitan area surrounding Taipei proper, is the most populous city.