Keelung in the context of "Taipei"

Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main island of Taiwan, also known as Formosa, lies between the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeast, and the Philippines to the south. It has an area of 35,808 square kilometres (13,826 square miles), with mountain ranges dominating the eastern two-thirds and plains in the western third, where its highly urbanized population is concentrated. The combined territories under ROC control consist of 168 islands in total covering 36,193 square kilometres (13,974 square miles). The largest metropolitan area is formed by Taipei (the capital), New Taipei City, and Keelung. With around 23.9 million inhabitants, Taiwan is among the most densely populated countries.

Taiwan has been settled for at least 25,000 years. Ancestors of Taiwanese indigenous peoples settled the island around 6,000 years ago. In the 17th century, large-scale Han Chinese immigration began under Dutch colonial rule and continued under the Kingdom of Tungning, the first predominantly Han Chinese state in Taiwanese history. The island was annexed in 1683 by the Qing dynasty and ceded to the Empire of Japan in 1895. The Republic of China, which had overthrown the Qing in 1912 under the leadership of Sun Yat-sen, assumed control following the surrender of Japan in World War II. But with the loss of mainland China to the Communists in the Chinese Civil War, the government moved to Taiwan in 1949 under the Kuomintang (KMT).

The history of the island of Taiwan dates back tens of thousands of years to the earliest known evidence of human habitation. The sudden appearance of a culture based on agriculture around 3000 BC is believed to reflect the arrival of the ancestors of today's Taiwanese indigenous peoples. People from China gradually came into contact with Taiwan by the time of the Yuan dynasty (1271–1368) and Han Chinese people started settling there by the early 17th century. The island became known by the West when Portuguese explorers discovered it in the 16th century and named it Formosa. Between 1624 and 1662, the south of the island was colonized by the Dutch headquartered in Zeelandia in present-day Anping, Tainan whilst the Spanish built an outpost in the north, which lasted until 1642 when the Spanish fortress in Keelung was seized by the Dutch. These European settlements were followed by an influx of Hoklo and Hakka immigrants from Fujian and Guangdong.

In 1662, Koxinga defeated the Dutch and established a base of operations on the island. His descendants were defeated by the Qing dynasty in 1683 and their territory in Taiwan was annexed by the Qing dynasty. Over two centuries of Qing rule, Taiwan's population increased by over two million and became majority Han Chinese due to illegal cross-strait migrations from mainland China and encroachment on Taiwanese indigenous territory. Due to the continued expansion of Chinese settlements, Qing-governed territory eventually encompassed the entire western plains and the northeast. This process accelerated in the later stages of Qing rule when settler colonization of Taiwan was actively encouraged. The Qing ceded Taiwan and Penghu to Japan after losing the First Sino-Japanese War in 1895. Taiwan experienced industrial growth and became a productive rice- and sugar-exporting Japanese colony. During the Second Sino-Japanese War it served as a base for invasions of China, and later Southeast Asia and the Pacific during World War II.

The Taipei–Keelung metropolitan area (Chinese: 臺北基隆都會區; pinyin: Táiběi-Jīlóng Dūhùiqū) also commonly known as Greater Taipei Area (Chinese: 大臺北地區; pinyin: Dà Táiběi Dìqū) is the largest metropolitan area in Taiwan. It is composed of 3 administrative divisions: Taipei, New Taipei City and Keelung. The region encompasses an area of 2,457.13 square kilometers (948.70 sq mi) and a population of 7,034,084 as of 2019. It is the most populous and the most densely populated metropolitan area in Taiwan, with one-third of Taiwanese people living and working there. In some sources, Taoyuan City is included in the metropolitan area on a broader extent, but is usually considered as a metropolitan area of its own.

The region is the epicenter of Taiwanese culture, economy, education and government. Designated as a global city, the region exerts a significant impact on commerce, finance, media, art, fashion, research, technology, education, and entertainment, both locally and internationally. As a diplomatic center, it is the home to all consulates and embassies in Taiwan. Its economic power makes the region the country's premier commercial and financial center as well as in the region of East Asia. Considered to be a global city and rated as an Alpha - City by GaWC, Taipei is part of a major high-tech industrial area. Railways, highways, airports, and bus lines connect Taipei with all parts of the island. The metropolitan area is served by two airports – Songshan and Taoyuan.

New Taipei City is a special municipality located in northern Taiwan. The city is home to an estimated population of 4,004,367 as of January 2023, making it the most populous city in Taiwan, and also the second largest special municipality by area, behind Kaohsiung. The top-level administrative divisions bordering New Taipei City are Keelung to the northeast, Yilan County to the southeast, and Taoyuan to the southwest, and it completely encloses the capital city of Taipei. Banqiao District is its municipal seat and biggest commercial area.

Before the establishment of Spanish and Dutch outposts in Tamsui in 1626, the area of present-day New Taipei City was mostly inhabited by Taiwanese indigenous peoples, mainly the Ketagalan people. From the late Qing era, the port of Tamsui was opened up to foreign traders as one of the treaty ports after the Qing dynasty of China signed the Treaty of Tientsin in June 1858. By the 1890s, the port of Tamsui accounted for 63 percent of the overall trade for entire Taiwan, port towns in the middle course of Tamsui River had also developed into bustling business and transportation centers. During the Japanese rule of Taiwan, the entire area of New Taipei City was organized as part of the Taihoku Prefecture. After the Republic of China took control of Taiwan in 1945, the present-day New Taipei City was designated on 7 January 1946 as Taipei County in Taiwan Province, which was constituted from the former Taihoku Prefecture, but not including present-day divisions of Taipei City, Keelung and Yilan County, the latter of which became detached from Taipei County on 10 October 1950. Its county status remained until 25 December 2010 when it was promoted to special municipal status and renamed as "New Taipei City".

Santísima Trinidad (meaning "Holy Trinity") was a bay on the northeast coast of Taiwan at Keelung, where in 1626 the Spanish established a settlement and built Fort San Salvador [zh]. They occupied the site until 1642 when they were driven out by the Dutch. The Dutch re-shaped the Spanish fort, reduced its size and renamed it Fort Noort-Holland [zh].

In 1661, Koxinga, a Southern Ming loyalist, with 400 warships and 25,000 men laid siege to the main Dutch fortress (Zeelandia in Anping). Defended by 2,000 Dutch soldiers, the Dutch left their fort in Keelung, when it became clear that no reinforcements were forthcoming from Zeelandia or Batavia (present day Jakarta, Indonesia).

The Japanese invasion of Taiwan, also known as Yiwei War in Chinese (Chinese: 乙未戰爭; May–October 1895), was a conflict between the Empire of Japan and the armed forces of the short-lived Republic of Formosa following the Qing dynasty's cession of Taiwan to Japan in April 1895 at the end of the First Sino-Japanese War. The Japanese sought to take control of their new possession, while the Republican forces fought to resist Japanese occupation. The Japanese landed near Keelung on the northern coast of Taiwan on 29 May 1895, and in a five-month campaign swept southwards to Tainan. Although their advance was slowed by guerrilla activity, the Japanese defeated the Formosan forces (a mixture of regular Chinese units and local Hakka militias) whenever they attempted to make a stand. The Japanese victory at Baguashan on 27 August, the largest battle ever fought on Taiwanese soil, doomed the Formosan resistance to an early defeat. The fall of Tainan on 21 October ended organised resistance to Japanese occupation, and inaugurated five decades of Japanese rule in Taiwan.

Taihoku Prefecture (臺北州; Taihoku-shū) was an administrative division of Taiwan created in 1920, during Japanese rule. The prefecture consisted of modern-day Keelung, New Taipei City, Taipei and Yilan County. Its government office, which is now occupied by the Control Yuan of Taiwan, was in Taihoku City (modern-day Taipei).