ボワベルジュのおすすめツーリングルート

1.5 km at an average gradient of 5.5%. A slightly challenging path.

Not much fun on a mountain bike, but it's OK on a gravel bike. A real steep and slightly technical gradient.

Not suitable for racing bikes.

At its origin, the underground of Naours was a chalk quarry used mainly for the tidal range of fields. In the 16th century, it was transformed into a refuge, called "muches" (Picard hiding places), for the inhabitants of the village, their goods and their animals until the end of the 17th century. Fallen into oblivion in the 19th century, the underground city will be rediscovered in 1887, studied from an archaeological point of view and then opened to visitors. An important occupation during the Thirty Years' War has been attested by archeology1. This underground city could shelter nearly 2,000 people. Throughout the galleries are the rooms of the different families. Also noticeable are the stables with the troughs, the ventilation chimneys and the smoke chimneys which stood out in those of the houses. Almost everywhere on the walls there are inscriptions, religious symbols, etc. with dates ranging from the year 1340 to 1792. It was finally used by British soldiers during the Second World War. The visit is worth the detour! Sources: http://www.citesouterrainedenaours.fr/ https://fr.wikipedia.org/wiki/Cit%C3%A9_souterraine_de_Naours https://vimeo.com/169669941

Portion of the Frévent - Abbeville greenway Surrounded by trees, very rolling and slight slopes :)