Penticton Penticton is a city in south central British Columbia, Canada between Okanagan Lake and Skaha Lake. The name Penticton is derived from a word in the Salish language, and it is roughly translated as "a place to stay forever". Penticton is the home of the Dominion Radio Astrophysical Observatory, Canada's only radio telescope array. It is also the sister city of Ikeda, Hokkaido, Japan.