Vervins is a commune located in the Aisne department within the Hauts-de-France region of northern France. It serves as a subprefecture of the department.
The town is situated between the Vilpion and Chertemps streams, which drain toward the Serre. It is bordered by several surrounding communes, including Fontaine-lès-Vervins, La Bouteille, Landouzy-la-Cour, Thenailles, Hary, Gercy, and Voulpaix.