Wasserbillig (Luxembourgish: Waasserbëlleg) is a town in the commune of Mertert, in eastern Luxembourg. As of 2005[update], Wasserbillig has 2,186 inhabitants, which makes it the largest town in Mertert. It lies at the confluence of the rivers Moselle and Sauer, which form the border with Germany at the town. Wasserbillig is the lowest settlement in Luxembourg, at 132 m above sea level. Despite its small population, Wasserbillig is home to ExxonMobil's largest petrol station, which serves the A1 motorway, leading into Germany. This is due to the considerably lower fuel taxes in Luxemburg, making it highly advantageous for motorists and truckers to fill their tanks before crossing the border. The service area is similarly a large outlet for tobacco, coffee and chocolate.