Geul

The Geul is a river in Belgium and in the Netherlands, where it is a right-bank tributary to the river Meuse.The source of the Geul is at about 300m above sea level in northeastern Belgium near the German border, south of the German town of Aachen. From there, after flowing some 20km in a northwestern direction, it leaves Belgium and enters the Netherlands at Cotessen in the Vaals municipality. After a further 38km in a west-northwestern direction through the most southern part of Limburg, which in its turn is the most southern province of the Netherlands, it flows into the Meuse, north of the city of Maastricht.A tributary of the Geul is the Gulp.Places through which the Geul passes are among others Kelmis, Valkenburg aan de Geul and Meerssen .PollutionThe water of the Geul is polluted seriously with heavy metals zinc and lead and as a result also is a serious source of heavy metal inflow into the Meuse.This pollution is a result of former zinc and lead mining activities near the Belgian towns of Kelmis (La Calamine) and Plombières (formerly named Bleiberg).The last ones of these mines have closed early in the 20th century. One of the reasons for giving up mining activities in Plombières was the occasional flooding of the mine by the Geul, as the bedrock (mainly Carboniferous limestone) contains many faults and fissures.