• On 1 January 2006, the former commune of
Bastendorf (from Diekirch Canton) was merged with the former commune of
Fouhren (from
Vianden Canton) to create the commune of
Tandel (in Vianden Canton). The law creating Tandel was passed on 21 December 2004. Therefore, Diekirch Canton ceded 24.44 km2 of land to Vianden Canton. • On 1 January 2012, the former communes of
Ermsdorf and
Medernach (both from Diekirch Canton) were merged to create the commune of Vallée de l'Ernz. The law creating the Vallée de l'Ernz was passed on 24 May 2011. ==Population==