Okanagan Lake is a lake in the Okanagan Valley of British Columbia, Canada. The lake is 135 km (84 mi) long, between 4 and 5 km wide, and has a surface area of 348 km2.

The Okanagan, also called the Okanagan Valley and sometimes the Okanagan Country, is a region in the Canadian province of British Columbia defined by the basin of Okanagan Lake and the Canadian portion of the Okanagan River. It is part of the Okanagan Country, extending into the United States as Okanogan County in north-central Washington. According to the 2016 Canadian census, the region's population is 362,258. The largest populated cities are Kelowna, Penticton, Vernon, and West Kelowna.