Take the following as truth: The vineyards hug the gentle slopes between the Vosges and the Rhine Valley along a single narrow 120-km (75-mile) strip that stretches from Marlenheim, just west of Strasbourg, down to Thann, outside Mulhouse.
Then the following statement: "Up to 15% of France's wine is produced by the vineyards each year." is true, false, or inconclusive?