Immediately west of the Columbia Mountains is a large and rugged Interior Plateau, encompassing the Chilcotin and Cariboo regions in central British Columbia (the Fraser Plateau), the Nechako Plateau further north, and also the Thompson Plateau in the south. The Peace River Valley in northeastern British Columbia is Canada's most northerly agricultural region, although it is part of the Prairies. The dry, temperate climate of the Okanagan Valley in south central British Columbia provides ideal conditions for fruit growing and a flourishing wine industry; the semi-arid belt of the Southern Interior also includes the Fraser Canyon, and Thompson, Nicola, Similkameen, Shuswap and Boundary regions and fruit-growing is common in these areas also, and also in the West Kootenay. Between the plateau and the coast is the province's largest mountain range, the Coast Mountains. The Coast Mountains contain some of the largest temperate-latitude icefields in the world.