Tianjin City, referred to as "Jin", also known as Jingu and Jinmen, is a municipality directly under the Central Government of the People's Republic of China, a national central city, and a megacity. It is located in the North China region of the People's Republic of China, in the lower reaches of the Haihe River Basin, in the northeastern part of the North China Plain, facing the Bohai Sea to the east, Yanshan Mountain to the north, and the capital Beijing to the west. The rest of the city is adjacent to Hebei Province. It has a warm temperate semi-humid monsoon climate with distinct four seasons. As of October 2023, Tianjin has 16 districts under its jurisdiction, with a total area of 11,966.45 square kilometers. As of the end of 2024, Tianjin's permanent population is 13.64 million.
Tianjin is located between 38°34′ and 40°15′ north latitude and 116°43′ and 118°4′ east longitude, in the Eastern 8th Zone of the International Time Zone. It has a total land area of 11,966.45 square kilometers, a coastline of 153.669 kilometers, and a land boundary of 1,137.48 kilometers. It lies on the west coast of the Pacific Ocean, northeast of the North China Plain, and in the lower reaches of the Haihe River Basin. It borders the Bohai Sea to the east, the Yanshan Mountains to the north, and the capital, Beijing, to the west. The rest of the city borders Hebei Province. It is the confluence and estuary of the Haihe River's five major tributaries: the South Grand Canal, the Ziya River, the Daqing River, the Yongding River, and the North Grand Canal. It is known as the "lower reaches of the nine rivers" and the "key point between rivers and seas."
Tianjin is a key central city in China, designated by the State Council as a national historical and cultural city, a modern maritime city, an international integrated transportation hub, a national advanced manufacturing R&D base, a northern international shipping core area, and a demonstration zone for financial innovation. Tianjin is a major node on the China-Mongolia-Russia Economic Corridor, a strategic fulcrum of the Maritime Silk Road, a juncture of the Belt and Road Initiative, and the easternmost starting point of the Eurasian Continental Bridge. It serves as a key seaport for neighboring landlocked countries, the largest port city in northern China, and a key location and gateway to the capital.