Torrenven
The Mariahout Woods, also known as Lieshoutse Bossen or Lieshoutse Heide, is an elongated forest area of 158 ha located immediately north of Mariahout.
The forest, owned by the municipality of Laarbeek, is a young heathland clearing and consists mainly of plantations of Scots pine, although other tree species, such as beech, can also be found.
In the southwest of the area lies the Torrenven. This is an elongated fen that was in danger of silting up and was cleaned up in 1992. The area surrounded by heathland remnants is now managed in such a way that the forest edge is pushed back, which counteracts silting by giving the wind more play on the water surface.