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
Politics of the Republic of China this structure remains in place, the President Lee Teng-hui in 1991 unofficially abandoned the government's claim of sovereignty over mainland China, stating that they do not "dispute the fact that the Communists control mainland China." However, the National Assembly has not officially changed the national borders, as doing so may be seen as a prelude to formal Taiwan independence (the People's Republic of China has threatened to start a war if the government of Taiwan formalizes independence). It should be noted that neither the National Assembly nor the Supreme Court has actually defined what the term "existing national boundaries," as