Rivière-des-Prairies is mainly composed of suburbs, as well as multiple forested areas and fields. Pointe-aux-trembles is more urban and dense but remains suburban in nature. The third district, La Pointe-aux-Prairies, is a typical suburb composed of townhouses, condos and single-family dwellings, which makes it a destination of choice for young families that wish to remain on the island of Montréal. The Saint Lawrence River flows at the southern border of Montreal, while the Rivière des Prairies River forms Montreal Island's northern boundary with Laval.