Trouée d'Arenberg
50°23′56″N 3°24′45″E / 50.399°N 3.4125°E
The Trouée d'Arenberg or Tranchée de Wallers-Arenberg (English: Trench of Arenberg) is a 2.3 km long cobbled road in the municipality of Wallers in Northern France, in the Département Nord. The road's official name is La Drève des Boules d'Hérin ("Bullet Alley of Hérin") and crosses the Forêt de Raismes-Saint-Amand-Wallers, outside France better known as the Forest of Arenberg. It is best known from the annual cycling classic Paris–Roubaix held in April, where it is one of the most difficult passages of the race.