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Port is made in Portugal’s Douro Valley. Much like how only sparkling wine from the Champagne region can be called Champagne, the EU countries have agreed that only wines produced in the Douro Valley ...

Still, a serving of port wine is smaller -- only equal to 3 ounces -- so, in that case, you'd only have to drink about 0.9 ounces of liquor (a little more than half a shot) to equal a glass of ...