Tricity - an urban area consisting of three Polish cities: Gdańsk, Gdynia and Sopot.
They are situated adjacent to one other, in a row, on the coast of the Gdańsk Bay,
Baltic Sea, in Eastern Pomerania (Pomeranian Voivodeship), northern Poland.

Gdansk - is the city at the centre of the fourth-largest metropolitan area in Poland.
It is Poland's principal seaport as well as the capital of the Pomeranian Voivodeship.
It is also historically the largest city of the Kashubian region.
The city lies on the southern edge of Gdańsk Bay (of the Baltic Sea), in a
conurbation with the spa town of Sopot, the city of Gdynia and suburban communities,
which together form a metropolitan area called the Tricity,
making it the largest city in the Pomerania region of Northern Poland.

Sopot - a seaside town in Eastern Pomerania on the southern coast
of the Baltic Sea in northern Poland
Sopot is a large health-spa and tourist resort destination,
well known for the longest wooden pier in Europe, the Molo (at 515.5 meters),
from which one can see the Gulf of Gdańsk. The city is also famous for its
Sopot International Song Festival, the largest such event in Europe
after the Eurovision Song Contest.

Gdynia - a city in the Pomeranian Voivodeship of Poland and
an important seaport at Gdańsk Bay on the south coast of the Baltic Sea.
Gdynia is part of a conurbation with the spa town of Sopot, the city of
Gdańsk and suburban communities, which together form
a metropolitan area called the Tricity