Taiwan Strait in the context of "Tamsui"

Most information about Taiwan before the arrival of the Dutch East India Company in 1624 comes from archaeological finds throughout the island. The earliest evidence of human habitation dates back 20,000 to 30,000 years, when lower sea levels exposed the Taiwan Strait as a land bridge. Around 5,000 years ago, farmers from what is now the southeast coast of China settled on the island. These people are believed to have been speakers of Austronesian languages, which dispersed from Taiwan across the islands of the Pacific and Indian Oceans. The current Taiwanese aborigines are believed to be their descendants.

Taiwan, officially the Republic of China (ROC), is a country in East Asia. The island of Taiwan, formerly known to Westerners as Formosa, has an area of 35,808 square kilometres (13,826 sq mi) and makes up 99% of the land under ROC control. It lies about 180 kilometres (112 mi) across the Taiwan Strait from the southeastern coast of the Mainland China. The East China Sea is to the north of the island, the Philippine Sea to its east, the Luzon Strait directly to its south, and the South China Sea to its southwest. The ROC also controls a number of smaller islands, including the Penghu archipelago in the Taiwan Strait, Kinmen and Matsu in Fuchien near the Mainland coast, as well as Pratas and Taiping in the South China Sea.

Geologically, the main island comprises a tilted fault block, characterized by the contrast between the eastern two-thirds, consisting mostly of five rugged mountain ranges running parallel to the east coast, and the flat to gently rolling plains of the western third, where the majority of the population resides. Several peaks exceed 3,500 m in height – the highest, Yu Shan at 3,952 m (12,966 ft), makes Taiwan the world's fourth-highest island. The tectonic boundary that formed these ranges remains active, and the island experiences many earthquakes, some of them highly destructive. There are also many active submarine volcanoes in the Taiwan Straits.

The South China Sea is a marginal sea of the Western Pacific Ocean. It is bounded in the north by South China, in the west by the Indochinese Peninsula, in the east by the islands of Taiwan and northwestern Philippines (mainly Luzon, Mindoro, and Palawan), and in the south by Borneo, eastern Sumatra, and the Bangka Belitung Islands, encompassing an area of around 3,500,000 km (1,400,000 sq mi). It communicates with the East China Sea via the Taiwan Strait, the Philippine Sea via the Luzon Strait, the Sulu Sea via the straits around Palawan, the Java Sea via the Karimata and Bangka Straits, and directly with the Gulf of Thailand. Additionally, the Gulf of Tonkin is part of the South China Sea.

$3.4 trillion of the world's $16 trillion maritime shipping passed through the South China Sea in 2016. Oil and natural gas reserves have been found in the area. The Western Central Pacific accounted for 14% of the world's commercial fishing in 2010.

Wade–Giles (/weɪd ˈdʒaɪlz/ wayd JYLZ) is a romanization system for Mandarin Chinese. It developed from the system produced by Thomas Francis Wade during the mid-19th century, and was given completed form with Herbert Giles's A Chinese–English Dictionary (1892).

The romanization systems in common use until the late 19th century were based on the Nanjing dialect, but Wade–Giles was based on the Beijing dialect and was the system of transcription familiar in the English-speaking world for most of the 20th century. Both of these kinds of transcription were used in postal romanizations (romanized place-names standardized for postal uses). In mainland China, Wade–Giles has been mostly replaced by Hanyu Pinyin, which was officially adopted in 1958, with exceptions for the romanized forms of some of the most commonly used names of locations and persons, and other proper nouns. The romanized name for most locations, persons and other proper nouns in Taiwan is based on the Wade–Giles derived romanized form, for example Kaohsiung, the Matsu Islands and Chiang Ching-kuo.

Fujian is a province in southeastern China. Fujian is bordered by Zhejiang to the north, Jiangxi to the west, Guangdong to the south, and the Taiwan Strait to the east. Its capital is Fuzhou and its largest prefecture city by population is Quanzhou, with other notable cities including the port city of Xiamen and Zhangzhou. Fujian is located on the west coast of the Taiwan Strait as the closest province geographically and culturally to Taiwan. This is as a result of the Chinese Civil War. Additionally, a small portion of historical Fujian is administered by Taiwan, romanized as Fuchien.

While the population predominantly identifies as Han, it is one of China's most culturally and linguistically diverse provinces. The dialects of the language group Min Chinese are most commonly spoken within the province, including the Fuzhou dialect and Eastern Min of Northeastern Fujian province and various Southern Min and Hokkien dialects of southeastern Fujian. The capital city of Fuzhou and Fu'an of Ningde prefecture along with Cangnan county-level city of Wenzhou prefecture in Zhejiang province make up the Min Dong linguistic and cultural region of Northeastern Fujian. Hakka Chinese is also spoken in Fujian, by the Hakka people. Min dialects, Hakka, and Standard Chinese are mutually unintelligible. Due to emigration, much of the ethnic Chinese populations of Taiwan, Singapore, Malaysia, Indonesia, and the Philippines speak Southern Min (or Hokkien).

The Penghu (/ˈpʌŋˈhuː/ PUNG-HOO, Hokkien POJ: Phîⁿ-ô͘  or Phêⁿ-ô͘ ) or Pescadores Islands are an archipelago of 90 islands and islets in the Taiwan Strait, about 50 kilometres (25 nautical miles) west of the main island of Taiwan across the Penghu Channel, covering an area of 141 km (54 sq mi). The archipelago collectively forms Penghu County. The largest city is Magong, on the largest island, which is also named Magong.

The Penghu islands first appear in the historical record in the Tang dynasty and were inhabited by Chinese people under the Southern Song dynasty, during which they were attached to Jinjiang County of Fujian. The archipelago was formally incorporated as an administrative unit of China in 1281 under Tong'an County of Jiangzhe Province in the Yuan dynasty. It continued to be controlled by Imperial China with brief European occupations by the Dutch Empire (1622–1624) and Second French colonial empire (1885), until it was ceded to the Empire of Japan in 1895. Japan’s surrender in 1945 ended its colonial rule over the Islands, which has since then been governed by the Republic of China (ROC). Under the terms of the Sino-American Mutual Defense Treaty and the subsequent Taiwan Relations Act between the ROC and the United States, Penghu is defined and geographically acknowledged as part of Taiwan.

Kinmen, alternatively known as Quemoy, is a group of islands governed as a county by the Republic of China (Taiwan), only 10 km (6 mi) east from the city of Xiamen in Fujian, located at the southeastern coast of the People's Republic of China, from which they are separated by Xiamen Bay. Kinmen is also located 187 km (116 mi) west from the closest shoreline of the island of Taiwan across the Taiwan Strait.

The county consists of the major island of Kinmen along with several surrounding islets, as well as Wuqiu Township remotely located 133 km (83 mi) northeast from the rest of the county. Kinmen is one of two counties that constitute Fuchien Province; the other is Lienchiang County (Matsu).