City Lights This striking photograph features two of Chinas most populous cities--Beijing and Tianjin--both located in the northern part of the country near the Bohai Gulf The United Nations estimated 2010 population for the Beijing metropolitan area is. City Lights This striking photograph features two of Chinas most populous cities--Beijing and Tianjin--both located in the northern part of the country near the Bohai Gulf The United Nations estimated 2010 population for the Beijing metropol