The Geleenbeek is a 44.7-kilometer (27.8-mile) river flowing through the province of Limburg in the southern Netherlands. Rising near Benzenrade, a hamlet in the municipality of Heerlen, the river traces a generally northwestern course through Nuth, Schinnen, and Spaubeek before turning north at Geleen, passing through the centre of Sittard, and continuing north through Nieuwstadt until it joins a branch of the Meuse at Stevensweert. Its Latin name, "Glana," translates to "bright brook," a fitting description for a stream fed by calcareous seepage water characteristic of the South Limburg landscape. The Geleenbeek valley is designated as a Natura 2000 area — the Geleenbeekdal — recognized for its species-rich wet woodlands and ecological significance. Ongoing restoration efforts under the project name Corio Glana have been reshaping the river since 2009, gradually returning it to a more natural, meandering course after it was heavily canalized in the 1950s.