The Ourthe (French pronunciation: [uʁt]; Walloon: Aiwe d' Oûte) is a 165-kilometre (103 mi) long river in the Ardennes in Wallonia, Belgium.

The source of the Ourthe Occidentale is near Libramont-Chevigny, in the Belgian province Luxembourg.

This is a vantage point located on a high cliff, above a meander of the Ourthe.

In the south, near Marcourt, there is another high cliff where the Hermitage and chapel of Saint-Thibaut is located.

The main remnant of these works is the unfinished channel tunnel in Bernistap (province of Luxembourg).