Mertert is a commune and town in eastern Luxembourg, on the border with Germany. It is part of the canton of Grevenmacher. The commune co…Mertert is a commune and town in eastern Luxembourg, on the border with Germany. It is part of the canton of Grevenmacher. The commune consists of the towns of Mertert and Wasserbillig. Mertert has a river port on the Moselle, the largest in Luxembourg. The commune's administrative centre is Wasserbillig.