The Coonawarra is a wine region in South Australia's Limestone Coast, well-known for its red wines. The region is identified by a strip of terra rossa soil (rich red topsoil over porous limestone) approximately 15km long, and only 2km wide along the Riddoch Highway just north of Penola . The official region boundaries have been subject to a number of disputes between vignerons and winemakers with grapes on the terra rossa, and other vines growing nearby. At least one vineyard (belonging to Penola High School) has the boundary pass through the middle.
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