Porvarinlahti used to be the only place where Vantaa directly bordered the Baltic Sea.
The bay is approximately 2 km long and 50 m wide.
Near the bay's mouth, at approximately 60°13′N 25°11′E / 60.217°N 25.183°E / 60.217; 25.183, was a three-municipality border point between Vantaa, Helsinki and Sipoo, with Vantaa forming a sort of wedge shape between Helsinki and Sipoo.
Helsinki thus gained a third neighbour municipality and Vantaa lost its only connection to the sea.
This Southern Finland location article is a stub.