It extends from the Notre-Dame-de-Bon-Secours Chapel on Saint Paul Street in Old Montreal to the bank of the Rivière des Prairies at the north end of the island. It is designated Route 335 from Sherbrooke Street to the Metropolitan Expressway, and is known as Bonsecours Street south of Saint Antoine Street. Along its length, it passes through the boroughs of Ville-Marie, Le Plateau-Mont-Royal, Rosemont-La Petite-Patrie, Villeray-Saint-Michel-Parc-Extension, and Ahuntsic-Cartierville.