 The boundaries of the AVA extend south from the Okanagan wilderness and include most of the Columbia River Basin extending east along the Snake River to the Idaho border.Many of the Columbia Valley's vineyards are planted along a broad, semi-arid plateau at altitudes of 1,000-2,000 feet (300–600 meters).The climate of the Columbia is continental, like most of Eastern Washington, though a wide range of microclimates exist.