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The western part of Gdansk Bay is formed by the shallow waters of the Bay of Puck and the southeastern part is the Vistula Lagoon, separated by the Vistula Spit and connected to the open sea by the Strait of Baltiysk. The maximum depth is 120 m, salinity 0.7 per cent.
The Bay of Gdansk receives the waters of the River VistulaVistula ( Polish Wisla is the longest river in Poland. It is 1,047 kilometers (678 miles) long and drains about 192,000 square kilometers (74,000 sq. miles), or almost two thirds of Poland's surface. The Vistula has its source in the south of the country, directly via three branches -- the LeniwkaThe Leniwka is a river, one of the branches of the Vistula. It flows in Poland to Gdansk Bay, forming the southern border of Ostrow Island. The current is limited. Polish rivers ., the Smiala WislaThe Smiala Wisla is a river, one of the branches of Vistula. It flows in Poland to Gdansk Bay. The Smiala Wisla is an western border of Sobieszewo Island and was created in 1840 during the flooding when it became a new mouth of Vistula. Polish rivers., and the Martwa WislaThe Martwa Wisla is a river, one of the branches of Vistula. It flows in Poland to Gdansk Bay. Polish rivers. -- and indirectly via the Vistula Lagoon with 2 branches: the NogatNogat is one of the arms of the Vistula river, in the Vistula delta. Goes to Vistula Bay. Main cities: Malbork. and the SzkarpawaThe Szkarpawa is a river, in the Vistula delta, one of the branches of Vistula. It flows in Poland to Gdansk Bay. Polish rivers..
Major ports are KaliningradKaliningrad ( Russian: , seaport city, capital and main city of the Kaliningrad Oblast, a small Russian exclave between Poland and Lithuania with access to the Baltic Sea. As Konigsberg (Polish Krolewiec Lithuanian Karaliaucius Latin Regiomontium it was t, Gdansk, Gdynia, Puck, and Hel.
The bay features two very long sandspits, the Hel peninsula and the Vistula Spit. The first forms the Bay of Puck while the latter defines the Vistula Lagoon, accessed through the Strait of Baltiysk.
Coastal cities include: Gdansk, Gdynia, Sopot, Pilawa, and Hel. Rivers: the Pregolya and the Vistula.