Mamer (Luxembourgish pronunciation) is a commune and town (strictly classified as a village) in south-western Luxembourg. It is located 7 km (4.3 mi) west of Luxembourg City. The commune includes Mamer itself, and also the smaller communities of Capellen and Holzem. Mamer is situated on the river Mamer, a tributary of the Alzette. The A6 motorway from Luxembourg to Brussels, also designated European route E25, runs through Mamer. As of 2014, Mamer, which lies in the east of the commune, has a population of 8,173. The town is the thirteenth-largest in Luxembourg. The commune as a whole is the fourteenth-most populous in the country.