A drive of about an hour and a half north of Terrace via the Nisga'a Highway. The road climbs out of the Skeena drainage into the Nass Valley, then runs for forty kilometres across the lava field — a stark, black, lichen-covered landscape pushed out by the Tseax Cone in the last major eruption in Canada.
The provincial park is co-managed with the Nisga'a Nation. There's a small visitor centre with displays on the eruption and Nisga'a oral history, a short walk to the cone itself (the trail is open seasonally and only with a guide), and several Nisga'a villages along the road. Allow a full day from Terrace, more if you want to walk to the cone.