The Éislek (Luxembourgish: [ˈɜɪ̯s.lek]), also known by its German name Ösling or Oesling, is a region covering the northern part of both the Grand Duchy of Luxembourg and Eifelkreis Bitburg-Prüm, within the greater Ardennes area that also covers parts of Belgium and France.
Almost all of Luxembourg's tallest hills are in the Éislek, particularly in the north and north-west, near the borders with Belgium and Germany.
Its main hill chains are cut by scenic river valleys, most notable those of the Clerve, Our, upper Sauer, and Wiltz.
[citation needed] In the late 18th century, a rural popular rising against the French Revolutionary forces was centered upon the Éislek area.
In World War II, the Battle of the Bulge was partly fought in the region in late 1944 and early 1945.