Étrœungt is bordered by ten other communes, including two from Aisne department: Avesnelles, Boulogne-sur-Helpe, Féron, Floyon, Haut-Lieu, La Flamengrie (Aisne), Larouillies, Rainsars, Rocquigny (Aisne), Sémeries.
Montreuil Abbey, or Montreuil-les-Dames, was a Cistercian nunnery in the Diocese of Laon, France, located at first at Montreuil-en-Thiérache (commune of Rocquigny, department of Aisne) until the 17th century and afterwards in Laon, where it was known as Montreuil-sous-Laon.