Tianjin, 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, a megacity, a national historical and cultural city, a modern marine city, an international comprehensive transportation hub city, a national advanced manufacturing R&D base, a northern international shipping core area, and a financial innovation operation demonstration area. At the same time,
Tianjin is also a major node of the China-Mongolia-Russia Economic Corridor, a strategic fulcrum of the Maritime Silk Road, a meeting point of the "Belt and Road Initiative", and the nearest eastern starting point of the Eurasian Continental Bridge. It is an important seaport for neighboring inland countries, the largest port city in northern China, and a key place and gateway to protect the capital.