 Southern Oregon AVA was established to allow the two principal winegrowing regions in the southern part of the state to market themselves jointly.This creation of a "super-AVA" is a departure from the trend in the Willamette Valley AVA or northern Oregon of establishing smaller AVAs specific to a particular locale's climate or soil conditions.The Southern Oregon AVA is the union of the Umpqua Valley AVA and the Rogue Valley AVA, and all land suitable for grape cultivation within the Southern Oregon AVA is also located in one of these smaller regions.