(or Tri-City, in Polish Trójmiasto) is an urban area consisting of three major Polish cities in Pomerania: Gdańsk, Gdynia and Sopot, as well as minor towns nearby them. They are situated adjacent to one other, in a row, on the coast of the Gdańsk Bay, Baltic Sea, in Pomerelia (Pomeranian Voivodeship), northern Poland. The Tricity metropolitan area has a population of over 1 million people. The name Trójmiasto was used informally or semi-formally only, until 28 March 2007, when the "Tricity Charter" (in Polish Karta Trójmiasta) was signed as a declaration of the cities' cooperation.
The Tricity, is one of Poland’s largest tourist attractions. Each of the cities making up the Tricity offers a different atmosphere. Gdańsk is a Hanseatic town more than 1,000 years old, while the lively Sopot and Gdynia are proof of the economic spirit of the Poles who, having regained their independence in 1918 after a century and a half of occupation, took less than 10 years to build one of the greatest ports on the Baltic. Sightseeing around the Tricity is relatively simple, because the cities are like beads on a string – the transport corridor linking Gdańsk with Gdynia. The charms of living in the Tricity combine harmoniously with natural attractions. The coastline offers a variety of environments, from the sandy beaches in Sopot and Gdańsk and the lowland coast of the Bay of Puck, to the cliff coastline of Redłowo and Oksywie. The vitality of flora and fauna on Sobieszewska Island, at the mouth of the Vistula, is truly amazing. An adventure on the Baltic Sea can start with a visit to one of the beaches in Stogi, Brzeźno or Sopot. Piers are a seaside attraction here. The oldest and longest pier in Sopot offers a walk of 516 meters into the sea. A seaside cruise is available from Długie Pobrzeże in Gdańsk, the pier in Sopot and the port in Gdynia. Most of the ships sail to Hel, a picturesque fishing port on the other side of the Bay of Gdańsk.