WEBWebsite. http://www.ptacn.com. The Port of Tianjin ( Tianjin Gang, Chinese: 天津港; pinyin: tiānjīn gǎng ), formerly known as the Port of Tanggu, is the largest port in Northern China and the main maritime gateway to Beijing. The name "Tianjin Xingang" ( Chinese: 天津新港; pinyin: tiānjīn xīngǎng; lit.