It begins in Belgium near Neerpelt (where the stream is called the Warmbeek) and runs into the Dommel in Eindhoven by way of Valkenswaard and Aalst.

The stream runs near the Achel Abbey, the Leenderbos, the Valkenhorst estates and the Genneper Parken park area.

Since the region was not tractable to extensive exploration, the early settlers probably never realized that the Tongelreep was a continuation of the Warmbeek.

In this area the river is joined by a parallel canal, which was built to power the Grevenbroek mill.

The river was canaled at this point, but this was undone by Staatsbosbeheer after they bought the land from the Abbey monks.