 A small strip of connecting territory is included in the Southern Oregon AVA to make it a contiguous region, however, this strip passes through mountainous regions not suitable for viticulture.The AVA lies entirely within the southwest corner of the state, south of Eugene and west of the Cascades, and consists of the river valleys of the Rogue and Umpqua River rivers and their tributaries.The Umpqua Valley AVA contains the drainage basin of the Umpqua River, excluding mountainous regions.