Vexin
![Map of France showing the general location of the historical Vexin region.](/Images/godic/202502/19/Vexin_localization4311.jpg")
![Map of the Vexin, Beauvoisis, and Hurepoix by Christophe Nicolas Tassin, 1634.](/Images/godic/202502/19/Carte_du_Vexin_Beauvoisis_et_Hurepoix_16344311.jpg")
![View of the Vexin region and the Seine river valley from La Roche-Guyon](/Images/godic/202502/19/Paysage_La_Roche_Guyon4311.jpg")
The Vexin (French pronunciation: [vɛksɛ̃]) is a historical county of northwestern France. It covers a verdant plateau on the right bank (north) of the Seine comprising an area east-to-west between Pontoise and Romilly-sur-Andelle (about 20 km before Rouen), and north-to-south between Auneuil and the Seine near Vernon. The plateau is crossed by the Epte and the Andelle river valleys.