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 Wild grapes <i>Vitis vinifera</i> are found in the eastern Mediterranean regions, stretching from Turkey, the southern Caucasus, and northern Iran. The earliest known wine production is found in northern Iran, the site of Hajji Faruz, a site that dates between 6000-5500 BCE. From evidence, it seems this early wine used terebinth as a form of preservative, similar to Greek wine Retsina that is still drunk today. This would suggest that Retsina wine is the oldest known wine type. The wine itself was made evident by residue of tartaric acid, a substance commonly found in grape wine.