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The Vistula and Nemunas rivers formed the Curonian Lagoon and the Curonian Spit Vistula Lagoon (Zalew Wiślany) and the bay of Gdańsk with its Hel peninsula. The inhabitants of these lands always held the gates to the Baltic Sea. One of the main factors that decided present land advantages ahead of the other Baltic areas was amber. The tradition of collecting amber and making and trading amber jewellery...