Gdańsk is Poland's principal seaport on the southern edge of the Baltic Sea. A convenient location connects it to a branch in the delta of the nearby Vistula River, whose waterway system supplies 60% of the area of Poland and connects Gdańsk to the capital in Warsaw. This gives the city a unique advantage as the center of Poland's sea trade. A lot of things come and go through Gdańsk--thus making it a highly important place for smugglers and traders to get goods from overseas.