Highway 113 starts in Terrace, at a junction with Highway 16. It goes north through Kitsumkalum Lake Provincial Park, and then along the eastern shore of Kitsumkalum Lake. It then goes north through places that provide access to Gitlakdamix, Gitwinksihlkw, Gingolx, Laxgalts'ap, and Nass Camp en route to its ending at a junction with Highway 37 in Cranberry Junction. Also along its route, it passes through Nisga'a Memorial Lava Bed Provincial Park.