Ourthe Occidentale is a river located in the Walloon region of Belgium. It is a tributary of the Ourthe river, which flows through the picturesque Ardennes region. The river is known for its scenic landscapes, making it a popular spot for outdoor activities such as hiking and kayaking. The river's source is near the village of Moulin de la Strument, and it flows through several towns before joining the Ourthe. The surrounding area is rich in biodiversity, featuring various plant and animal species, and is an important part of the local ecosystem.