Around 1200 the Suikerrui formed the Southern border of the town, but pretty soon the city started to grow and the Suikerrui only held its function as an inner harbour. If you see a streetname that ends on rui, vliet, vest or brug, it means that there used to be water in the neighbourhood in former times. Unfortunately all this water has disappeared from the city, or maybe it is better to say that it is kept from sight, because under street level the complete canal system is still present.