Constanta, historically known as Tomis, is the oldest continuously inhabited city in Romania. It was founded around 600 BC. The city is located in the Northern Dobruja region of Romania, on the Black Sea coast. It is the capital of Constanta County and the largest city in the historical region of Dobruja.

As of the 2011 census, Constanta has a population of 283,872, making it the fifth most populous city in Romania. The Constanta metropolitan area includes 14 localities within 30 km (19 mi) of the city, and with a total population of 425,916 inhabitants, it is one of the largest metropolitan areas in Romania.

The Port of Constan?a has an area of 39.26 km² (15.16 sq mi) and a length of about 30 km (19 mi). It is the largest port on the Black Sea, and one of the largest ports in Europe.