High Quality Content by WIKIPEDIA articles! Okanagan Mountain is a mountain in the Okanagan region of the Southern Interior of British Columbia, Canada, located on the east side of Okanagan Lake on the immediate south of the city of Kelowna and north of Penticton. It is the core of Okanagan Mountain Provincial Park and its north slopes have also become a residential neighbourhood of Kelowna, much of which was destroyed in the Okanagan Mountain forest fire in 2003.