A land of rivers: the Sambre, Helpe Major and Helpe Minor, the Avesnois has always known how to handle water and still had over 200 mills a century ago. It is a natural area punctuated by woods and the forest-covered slopes of Trélon and Mormal, and with its 9,000 hectares, is the largest in the region. A wooded countryside with, in particular, its hedges criss-crossing the landscape which its farmers planted in the 7th century. Woodlands that the Regional Nature Park is committed to conserve on a daily basis, by working very closely with the farmers and local authorities, and encouraging planting, restoration of ponds, and the creation of orchards . Particularly attractive in this respect are the areas of Fagne de Trélon (around Trélon) and the Thiérache, south east of Maroilles.