Gemeng Käerjeng is one of the 106 communes in the Grand Duchy of Luxembourg. It is situated in the south-west of the country in the canton of Capellen.
Gemeng Käerjeng has a population of approximately 10,000 citizens and has the 9th-highest commune population in Luxembourg.
Gemeng Käerjeng is located on the dividing line of the waters of the Rhine basin (Eisch) and the watershed of the Meuse (Chiers). It is bordered by the communes of Pétange, Differdange, Sanem, Dippach, Garnich and Steinfort, as well as the Belgian border to the north-west.
Elevation: Between 247 m (810 ft) at Tapp near Linger and 362 m (1,188 ft) at Kues near Fingig.
Total area: 52.2 km2 (20.15 sq mi)
The commune consists of the following villages: