What is "stadsdriehoek"

Stadsdriehoek is a neighborhood at the center of Rotterdam, The Netherlands. The name Stadsdriehoek ("City Triangle") refers to the historical triangular form of the city of Rotterdam, which was bordered by the Coolsingel and the Schiedamsevest to the west, the Goudsevest to the northeast, and by the Nieuwe Maas to the south.