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The Two Woods and the Quilienne river

A lovely walk on the borders of Pas-de-Calais and the Somme.You'll discover the pretty Quilienne river (which did a lot of damage in 2016) and the Bois de Saint-Pierre (woods).
It's possible to add one or two extensions, so that the trail can exceed 22km (see practical info).
L'ubac de Rebreuve-sur-Canche

A short, unpretentious and easy route.Very small roads and paths for a relaxing half-day out.
The Authie river, the ravine and the moor

This nearly roadless route takes in the wild Ravin des Cavernes and the astonishing moorland of Nœux-lès-Auxi (le Rietz).
Le Rietz de Nœux is a protected nature reserve. In spring, it's home to the most beautiful orchids. Goes without saying, don't pick them!
This circuit takes up a large part of the "Sentier de l'Étoile" (Path of the Star), of which there are a few routes, but no description. What's more, there are very few markings. The gates are near the fence on the right.
Before tackling this route, I advise you to watch the 2 videos linked in Denis' commentary.
De la Canche au Bois de Mortagne

Un départ pépère sur de bons chemins, puis un passage par le Sentier des Culs Trempés avant une belle remontée sur Canettemont.
The Canche, the moorland and the Ravin des Cavernes
In the Riez de Nœux-les-Auxi, there is a beautiful walk along the Canche in Boubers and Ligny. With the climb up the Ravin des Cavernes, you really feel like you are in another world (even more so now, with the final chaos). The route becomes very difficult in wet weather in the Riez and the ravine.
Loop to the north-west of Auxi-le-Château
This loop allows you to discover the banks of the Authie and its marshes before leaving the valley and climbing up to the plateau. It finally skirts around the Pâture Mille Trous nature reserve. There is a beautiful view of Auxi-le-Château and its 15th-century listed church.
Discover three "Heritage Villages" starting from Auxi-le-Château
This hike through hills and valleys allows you to discover the three "Heritage Villages" surrounding Auxi-le-Château. It offers a variety of landscapes that testify to the inhabitants' attachment to their heritage and respect for diversity.
Loop east of Auxi-le-Château via the old railway line
This walk allows you to discover the Authie valley on the east side. We pass by the old Auxi-le-Château railway station, which is a fine example of the restoration and conversion of existing heritage. Also worth noting is the small military cemetery, which reminds us of the horrors of war. Finally, enjoy the superb views of the valley and the charming town of Auxi.
Two castles from Hauteville
This hike between plains and woods will take you to Barly Castle. Listed as a historic monument, it was built in 1780 by the Blin family. It is open to visitors today. You will also see Fosseux Castle, which was built in 1770 by Parisian architect Villetard at the request of Ferdinand Dubois de Hoves de Fosseux.
Sentier du bout du monde (End of the World Trail) from Warlus

An easy hike on beautiful paths that will take you through Simencourt and Berneville. Warlus was the seat of a seigneury before the revolution. This hike in the plains, with a few wooded sections, is ideal for families.
The Chemin Vert in Aubigny-en-Artois
This is a reworking of an existing route, part of which has unfortunately disappeared due to lack of maintenance. The route through Aubignyen-Artois has also been modified to take the old, less busy streets, and a return trip to Villers-Châtel has been added to admire the church and castle.The circuit is done in the opposite direction to the signposting, which allows you to start with the most urban part.See practical information
Discover the splendours of Mont Saint-Éloi, Écoivres & Acq

This walk is loosely based on the "Sentier des Pierres du Diable" (Devil's Stone Trail), but allows you to discover, alongside the famous Devil's Stones, the magnificent Mont-Éloi Abbey, the Écoivres war cemetery, the churches of Écoivres, Acq and Mont Saint-Éloi, and the Acq mill.
Château de Villers-Châtel from Cambligneul
This hike in the Artois plain will take you along good paths to Villers-Châtel and its castle, park and cave, where you can enjoy the surrounding landscapes, biodiversity and heritage.
Les Droites Pierres via Mont-Saint-Éloi

This walk starts in Écoivres, a hamlet in Mont-Saint-Éloi, and takes you through the surrounding villages. Don't forget to visit the Droites Pierres (Straight Stones), or Pierres du Diable (Devil's Stones) according to legend, and climb up to the old abbey.
Trail towards Caucourt Ford

Caucourt is a small village near Olhain.From the church, you cross pleasant plains and villages, especially on sunny days.Avoid this route in very hot weather, as it is not much shade; in rain or fog, the view won't be as good!...
In the direction of the trail, you'll save the best until last, the Gué de Caucourt and its mill.