Cathedral Mountain is a complex massif located six kilometres northwest of Lake O'Hara in Yoho National Park, in the Canadian Rockies of British Columbia, Canada. Its shape and structure conjures up a resemblance to a gothic cathedral that has inspired many artists, including Group of Seven's Arthur Lismer, to paint it back in 1928. This picturesque mountain is visible from Highway 1, the Trans-Canada Highway near Kicking Horse Pass. Its nearest higher peak is Mount Stephen, to the west. To prevent damage to its operations, CP Rail pumps overflow from Teacup Lake down the west face of Cathedral in order to minimize the subglacial lake's discharging in a phenomenon known as a jökulhlaup.