Chongqing is a modern city, with an ancient history spanning more than 3,000 years. It is the nation's fourth municipality after Beijing, Shanghai and Tianjin. It encompasses within its borders, a great wealth of water reserves, mineral resources, dense forests and abundant flora and fauna. Being the focal point of the unique Yangtze Three Gorges tourist industry, Chongqing is a tourist attraction as well as being a commercial city. Situated in the upper reaches of the Yangtze River - at the confluence of Yangtze and Jialing Rivers, in Southwest China, Chongqing is a port city with the largest area and population in China.