Tianjin and Constanţa are friendly associated on March, 7th, in 1995.

Constanţa is the name of a county (judeţ) in the Dobruja region of Romania. Its capital city is also named Constanţa.

In 2002, it had a population of 715,151, the county area is 7,071km2.

Agriculture is an important part in the county's economy, with Constanţa being the county with the largest irrigation systems in the country (more than 4,300 km² before 1989, now greatly reduced), cereals being the most important products. Also, the county is famous for its wines from the Murfatlar region. At Cernavodă there is a nuclear power plant with two reactors, each of the CANDU type of Canadian design. The plant covers over 15% of the country's power demand. The Port of Constanţa is the largest port in Romania and one of the most important on the Black Sea. It is linked with the Danube by the Danube-Black Sea Canal - the widest and deepest navigable channel in Europe, although it is not used to its full potential.