Mamer is a commune and town in south-western Luxembourg. It is located 7 km west of Luxembourg City. The commune includes both Mamer i…Mamer is a commune and town in south-western Luxembourg. It is located 7 km west of Luxembourg City. The commune includes both Mamer itself and 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.