Geography of Taiwan water supplies, and trade in endangered species. Though regulation of sulfate aerosol emissions from petroleum combustion is becoming stringent, acid rain remains a threat to the health of residents and forests. Atmospheric scientists in Taiwan estimate that more than half of the pollutants causing Taiwan's acid rain are carried from mainland China by monsoon winds. Geography of Taiwan Taiwan, formerly known as Formosa, is an island in East Asia; located some off the southeastern coast of mainland China across the Taiwan Strait. It has an area of , which includes other nearby islands such as Penghu (). The East China
Mainland Travel Permit for Taiwan Residents Mainland Travel Permit for Taiwan Residents The Mainland Travel Permit for Taiwan Residents, also known as Taiwan Compatriot Permit, is a type of travel document issued by Ministry of Public Security of the People's Republic of China (MPS) to nationals of the Republic of China (Taiwan) with household registration in the Taiwan Area for entry into Mainland China. The Republic of China passport is not considered as a valid travel document by the People's Republic of China (except when entering at Changsha airport and holding two photos). The permit serves as the main travel document and identity document for ROC