Castle Rock is a volcanic plug located 13 km west of Iskut and 8 km northwest of Tuktsayda Mountain in British Columbia, Canada. Castle Rock is part of the Pacific Ring of Fire that includes over 160 active volcanoes and is in the Klastline Group of the Northern Cordilleran Volcanic Province and last erupted in the Pleistocene. Castle Rock is one of ten major Canadian volcanoes with recent seismic activity, the others being the Mount Edziza volcanic complex, Mount Cayley, Hoodoo Mountain, The Volcano, Crow Lagoon, Mount Silverthrone, the Mount Meager massif, the Wells Gray-Clearwater volcanic field and Mount Garibaldi.