Refine your search for walks in Saint-Michel-sous-Bois
5 woods and some steep slopes

A very hilly route over the Artois heights.
A great sporting outing with beautiful scenery.
The Canche from Montreuil

A bucolic hike along the pure, fish-filled waters of the Canche, starting at La Citadelle, whose Royal Castle dates back to the 13th century. You'll start by walking along the ramparts. You'll pass through the marshes and stroll along the banks of La Canche. You may come across fishermen or sportsmen training at the Canoe-Kayak club.
An uphill battle

It's a route that will delight altitude enthusiasts (Carto exploreur and the Visorando app suggest it's as high as 500m). What's more, the views are stunning.
Route slightly modified in November 2019.
All trails are very good as of May 14, 2020 (even if some are very grassy).
Walk through the Artois Heights

A winding route offering superb views of the Artois heights and the Bléquin valley.
Trou du Charme Trail
Lovely family outing in the Desvroise countryside, on small paved country roads.Passes close to streams, forests, villages and farms.
Around Bomy

A short walk in the Artois region, particularly pleasant in autumn.
The trail of the Cucq dunes

Come and take a stroll in the Stella dunes, a very fragile Natura 2000 listed natural environment, to be explored with respect. Most of this trail is covered in sand. You'll discover three types of dunes (embryo, white and grey), with lovely panoramic views from the top. You'll walk alongside the sea and discover Bois Joly. A very fine hike, albeit a little physically demanding.
The Bay of the Canche from Camiers

Easy hike in two loops, discovering the Baie de la Canche and its nature reserve, through dune woods with lovely views over the bay and Le Touquet in the first part, then through marshes and the bay, with access to the beach. Return through a wild cherry wood.
Back to the Elnes hillside
This place is so beautiful that it deserves a second route.Another good climb with 2 nice climbs and a maximum of paths and trails.
Difficult in dry weather and very difficult in wet weather.
On the ridges around Bergueneuse

More than 22 km of trails for a nature trail with some nice climbs and descents. Sharpen your calves!Beautiful views, woods and, if you're lucky, a few wild animals. At least, the ones that the hunters don't slaughter, as we recently freed two roe deer caught in snares (fox traps, but any animal can get caught there, and it's legal!).
The Surgeon hills

A short, undulating route offering beautiful views.
Between dunes and forest in Écault

A mix of surprising landscapes: a faux medieval castle, a forest of deciduous and coniferous trees, then you come out at the top of a dune overlooking the beach. Most of the walk is in the shade and there is a beach for picnics.
The Wavrans Valley

The Wavrans-sur-l'Aa nature reserve consists of two hillsides separated by a dry valley, Mont Carrière and Montagne d'Elnes. The chalky slopes of the reserve are steep and unusual for the region. They were also "sculpted" by the bombs of the Second World War.
Hardelot-Plage (Neufchâtel-Hardelot) - Étaples

From Hardelot, the trail continues along the beach. It temporarily leaves the beach to cross the Mont Saint-Frieux dune. At Camier, it leaves the coast to join the trail that crosses the Baie de Canche Nature Reserve, offering a beautiful view of the bay. It then descends to the Canche estuary, which it follows up to Étaples.
From Moringhem to Quelmes

A pleasant, virtually roadless route, with the possibility of a pleasant break at the beautiful Quelmes café.
The Saint-Louis Chapel from Tournehem-sur-la-Hem

A lovely walk through woods and hedged farmland to the pretty Chapelle Saint-Louis. It's a signposted trail run by the Communauté d'Agglomération du Pays de Saint-Omer.
Ecou marsh “Marais d’Ecou” in Tilques

Houses, each with its own dock and boat moored on the Lansberg. People fishing practically from their homes. Cottages, each more beautiful than the last. Little market gardeners' boats loaded with crates of vegetables heading off to who knows where.Truly, the passage along the Lansberg will delight you with its beauty.You'll find a tranquil, picturesque feel that's rare in the region.
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.