TIANJIN - Tianjin Port said Sunday its annual cargo throughput crossed the 500 million tons mark for the first time, while remaining as the world's fourth-largest harbor by cargo throughput.

Located on the coast of the Bohai Sea, the Tianjin Port follows the Ningbo-Zhoushan Port, the Port of Shanghai -- both in East China -- and the Port of Singapore in terms of cargo throughput volume.

Improved infrastructure and steady goods flows from the inland have contributed to the rapid growth in the port's throughput, with coal, oil products, ores and steel being the main goods delivered by the harbor, said officials at the Tianjin Port (Group) Co.

The largest comprehensive port in North China, the Tianjin Port has established trade ties with more than 500 ports in 180 countries and regions around the world.