Heijenrath (in Limburg: Heieret) is a hamlet located in the southernmost part of the Dutch province of Limburg with about 125 inhabitants. The hamlet is located in the municipality of Gulpen-Wittem, on top of a hill plateau, the Plateau of Crapoel, between Slenaken in the Gulpdal west and Epen in the Geuldal east. Heijenrath is still counted by some as one of the three neighborhoods belonging to Slenaken (together with Beutenaken and Schilberg). The distance to Slenaken is about one kilometer.
The hamlet is mostly known because it is located at the top of the Loorberg, one of the heaviest and longest climbs in the cycling classic Amstel Gold Race. This mountain is climbed several times during the match.
In the hamlet is the Mariakapel Heijenrath at a crossroads of roads. This 1875 chapel is one of the two national monuments that Heijenrath counts, along with an elongated farm with a winged horn from the first half of the 19th century.
The hamlet of Heijenrath consists of a small core of habitation, surrounded by meadows. In the vicinity of Heijenrath there are several slope forests. To the west lies Groote Bosch, in the south the Roebelsbos, in the southeast the Lower Bosch and in the East De Molt.