Approximately 160 kilometers northwest of Paris, just west of the city of Rouen lies the Forêt Domaniale de Brotonne, or the Forest of Brotonne. It follows the final turns of the Seine to its mouth in the English Channel. It is said to be the remnant of the vast primeval forests that covered the area. Originally, it went by the ancient name of Arélaune, but due to predictably violent reasons became known by the Norse name of Brotonne (those crazy Vikings).
The forest boasts over 90 species of trees and 50 ponds and still manages to be the largest beech forest in France. Today, it appears to be a highly-managed wild area with the protection of the flora and fauna.
Follow this link for an impressive photo on Flikr.