 Together with the Moisie River, the Natashquan is one of the most renowned salmon rivers on the North Shore of the Gulf.The Natashquan River is entirely within the Grenville geologic province of the Canadian Shield, characterized by a hilly plateau, ranging in altitude from to , and consisting of felsic and metamorphic rock (such as gneiss, migmatite and granite), clastic rock (quartzite) and schists in the lower portion, with a few intrusions of mafic rock (diorite and gabbro) in the central part.The river largely runs through narrow valleys, and is fed by about 30 tributaries, of which the most significant are in downstream order