Geography of Taiwan and Green Island to the southeast, separated from the northernmost islands of the Philippines by the Bashi Channel. The islands of Kinmen and Matsu near the coast of Fujian across the Taiwan Strait have a total area of ; the Pratas and Taiping islets in the South China Sea are also administered by the ROC, but are not part of the Taiwanese archipelago. The island of Taiwan was formed approximately 4 to 5 million years ago at a complex convergent boundary between the Philippine Sea Plate and the Eurasian Plate. In a boundary running the length of the island and
History of Taiwan counseled that the island was "a ball of mud beyond the sea, adding nothing to the breadth of China" (海外泥丸，不足為中國加廣), and advocated removing all the Chinese to mainland China and abandoning the island. It was only the campaigning of admiral Shi Lang and other supporters that convinced the emperor not to abandon Taiwan. Koxinga's followers were forced to depart from Taiwan to the more unpleasant parts of Qing controlled land. By 1682 there were only 7000 Chinese left on Taiwan as they had intermarried with aboriginal women and had property in Taiwan. The Koxinga reign had continued the tax systems