Taiwan was joined to the Asian mainland in the Late Pleistocene, until sea levels rose about 10,000 years ago. Human remains and Paleolithic artifacts dated 20,000 to 30,000 years ago have been found. Study of the human remains suggested they were Australo-Papuan people similar to Negrito populations in the Philippines. Paleolithic Taiwanese likely settled the Ryukyu Islands 30,000 years ago. Slash-and-burn agriculture practices started at least 11,000 years ago.

Stone tools of the Changbin culture have been found in Taitung and Eluanbi. Archaeological remains suggest they were initially hunter-gatherers that slowly shifted to intensive fishing. The distinct Wangxing culture, found in Miaoli County, were initially gatherers who shifted to hunting.

Around 6,000 years ago, Taiwan was settled by farmers of the Dapenkeng culture, most likely from what is now southeast China. These cultures are the ancestors of modern Taiwanese Indigenous peoples and the originators of the Austronesian language family. Trade with the Philippines persisted from the early 2nd millennium BCE, including the use of Taiwanese jade in the Philippine jade culture.

The Dapenkeng culture was succeeded by a variety of cultures throughout the island, including the Tahu and Yingpu; the Yuanshan were characterized by rice harvesting. Iron appeared in such cultures as the Niaosung culture, influenced by trade with China and Maritime Southeast Asia. The Plains Indigenous peoples mainly lived in permanent walled villages, with a lifestyle based on agriculture, fishing, and hunting. They had traditionally matriarchal societies.
The Penghu Islands were inhabited by Han Chinese fishermen by 1171, and in 1225 Penghu was attached to Jinjiang. The Yuan dynasty officially incorporated Penghu under the jurisdiction of Tong'an County in 1281. Penghu was evacuated in the 15th century by the Ming dynasty as part of their maritime ban, which lasted until the late 16th century. In 1349, Wang Dayuan provided the first written account of a visit to Taiwan. By the 1590s, a small number of Chinese from Fujian had started cultivating land in southwestern Taiwan. Some 1,500-2,000 Chinese lived or stayed temporarily on the southern coast of Taiwan, mostly for seasonal fishing but also subsistence farming and trading, by the early 17th century. In 1603, Chen Di visited Taiwan on an anti-wokou expedition and recorded an account of the Taiwanese Indigenous people.

In 1591, Japan sent envoys to deliver a letter requesting tribute relations with Taiwan. They found no leader to deliver the letter to and returned home. In 1609, a Japanese expedition was sent to survey Taiwan. After being attacked by the Indigenous peo…

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The land controlled by the ROC consists of 168 islands with a combined area of 36,193 square kilometres (13,974 sq mi). The main island, known historically as Formosa, makes up 99 percent of this area, measuring 35,808 square kilometres (13,826 sq mi) and lying some 180 kilometres (112 mi) across the Taiwan Strait from the southeastern coast of mainland China. The East China Sea lies to its north, the Philippine Sea to its east, the Luzon Strait directly to its south and the South China Sea to its southwest. Smaller islands include the Penghu Islands in the Taiwan Strait, the Kinmen, Matsu and Wuqiu islands near the Chinese coast, and some of the South China Sea islands.

The main island is a tilted fault block, characterized by the contrast between the eastern two-thirds, consisting mostly of five rugged mountain ranges parallel to the east coast, and the flat to gently rolling plains of the western third, where the majority of Taiwan's population reside. There are several peaks over 3,500 metres, the highest being Yu Shan at 3,952 m (12,966 ft), making Taiwan the world's fourth-highest island. The tectonic boundary that formed these ranges is still active, and the island experiences many earthquakes. There are also many active submarine volcanoes in the Taiwan Strait.

Taiwan contains four terrestrial ecoregions: Jian Nan subtropical evergreen forests, South China Sea Islands, South Taiwan monsoon rain forests, and Taiwan subtropical evergreen forests. The eastern mountains are heavily forested and home to a diverse range of wildlife, while land use in the western and northern lowlands is intensive. The country had a 2019 Forest Landscape Integrity Index mean score of 6.38/10, ranking it 76th globally out of 172 countries.
Taiwan lies on the Tropic of Cancer, and its general climate is marine tropical. The northern and central regions are subtropical, whereas the south is tropical and the mountainous regions are temperate. The average rainfall is 2,600 millimetres (100 inches) per year for the island proper; the rainy season is concurrent with the onset of the summer East Asian Monsoon in May and June. The entire island experiences hot, humid weather from June through September. Typhoons are most common in July, August and September. During the winter (November to March), the northeast experiences steady rain, while the central and southern parts of the island are mostly sunny.

Due to climate change, the average temperature in Taiwan has risen 1.4 °C (2.5 °F) in the last 100 years, twice the worldwide temperature rise. The goal of the Taiwanese government is to cut carbon emissions by 20 percent in 2030 and by 50 percent in 2050, compared to 2005 levels. Carbon emissions increased by 0.92 percent between 2005 and 2016.

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The government of the Republic of China was founded on the 1947 Constitution of the ROC and its Three Principles of the People, which states that the ROC "shall be a democratic republic of the people, to be governed by the people and for the people". It underwent significant revisions in the 1990s, known collectively as the Additional Articles. The government is divided into five branches (Yuan): the Executive Yuan (cabinet), the Legislative Yuan (Congress or Parliament), the Judicial Yuan, the Control Yuan (audit agency), and the Examination Yuan (civil service examination agency).

The head of state and commander-in-chief of the armed forces is the president, who is elected by popular vote for a maximum of 2 four-year terms on the same ticket as the vice-president. The president appoints the members of the Executive Yuan as their cabinet, including a premier, who is officially the President of the Executive Yuan; members are responsible for policy and administration.

The main legislative body is the unicameral Legislative Yuan with 113 seats. Seventy-three are elected by popular vote from single-member constituencies; thirty-four are elected based on the proportion of nationwide votes received by participating political parties in a separate party list ballot; and six are elected from two three-member aboriginal constituencies. Members serve four-year terms. Originally the unicameral National Assembly, as a standing constitutional convention and electoral college, held some parliamentary functions, but the National Assembly was abolished in 2005 with the power of constitutional amendments handed over to the Legislative Yuan and all eligible voters of the Republic via referendums.

The premier is selected by the president without the need for approval from the legislature, and neither the president nor the premier wields veto power. Historically, the ROC has been dominated by strongman single party politics. This legacy has resulted in executive powers currently being concentrated in the office of the president rather than the premier.

The Judicial Yuan is the highest judicial organ. It interprets the constitution and other laws and decrees, judges administrative suits, and disciplines public functionaries. The president and vice-president of the Judicial Yuan and additional thirteen justices form the Council of Grand Justices. They are nominated and appointed by the president, with the consent of the Legislative Yuan. The highest court, the Supreme Court, consists of a number of civil and criminal divisions, each of which is formed by a presiding judge and four associate judges, all appointed for life. In 1993, a separate constitutional court was established to resolve constitutional disputes, regulate the act…

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