Keelung City, the city of Taiwan Province of the Republic of China, is located in the northeast of Taiwan's main island. It is famous for its natural harbor in the deep-water valley. It is the northernmost city in Taiwan. Keelung Port, located in the city center, is the main shipping hub of northern Taiwan. It is listed as the two largest port capitals of Taiwan alongside Kaohsiung in southern Taiwan. The city has a population of more than 367,000 (until November 2020); 95% of the land under its jurisdiction is hilly land, surrounded by mountains on the east, west and south, and adjacent to New Taipei City. Only a small amount of flat land is adjacent to the East China Sea in the north.
After the 1990s, it was transformed into an important satellite city in the Taipei Metropolitan Area. Because of the importance of geographical location, Keelung occupies a place in the traces of Taiwan's history.