Every trekking itinerary through the central High Atlas eventually finds Aït Bouguemez, the Happy Valley — its wide cultivated floor, its walnut trees, its terraced fields stitched together along the wadi under the gaze of Jbel M'Goun. The valley earns its nickname. It is genuinely happy-looking in the way that a well-farmed, well-watered mountain valley at 2,000 meters always looks happy: productive, settled, alive with the details of a community that has made a particular landscape work for a very long time. It is also, increasingly, on the tour bus route. The guesthouses fill up in season. The trekking agencies start here.

Ten kilometers west of Agouti, accessible by the same road and then a steep descent into a completely different world, Aït Bou Oulli runs narrower and stranger and almost completely alone. The trek starts with a steep downhill on a sheer mountain side into the valley. The valley is narrow with thick walnut trees throughout the entire wadi. Where Aït Bouguemez is broad and farmed and social, Aït Bou Oulli is geological: a valley defined less by what people have done to it than by what the earth was doing long before people arrived. The valley possesses geological and geomorphological heritage which is very rich, much diversified and exceptional landscapes of high mountains. Fairy chimneys. Glacial cirques. U-shaped valleys carved by ice. Badlands striped in burnt orange, ochre, and deep red. Rock engravings two to three thousand years old. And almost no one.

The mineral colours that define Aït Bou Oulli are not a lighting effect or a photographer's filter. They are the exposed geology of the central High Atlas, a rock sequence that runs from the Paleozoic era through successive layers of limestone, sandstone, and volcanic intrusion, each stratum a different shade and each tilted at angles that make the full sequence legible from the valley floor. The geological history dates back to the Paleozoic with angular unconformity — the point at which younger horizontal rock layers were deposited on top of older tilted ones, leaving a visible break in the geological record that geologists read as a billion-year gap in time compressed into a few meters of cliff face.

The geomorphological inventory of the valley is extraordinary for a place that receives so few visitors. Spectacular waterfalls, water sources, canyons, glacial cirques and U-shaped valleys, superficial karstic forms including sinkholes and swallow-holes, high-Atlas peaks and cliffs, spectacular scree slopes, badlands landscapes, and fairy chimneys have been mapped by Moroccan geographers working to build the case for the valley's inclusion in expanded geopark circuits. The glacial cirques are among the most striking: bowl-shaped hollows scooped from the upper walls of the valley by glaciers during the last ice age, now empty and visible as curved indentations in the cliff line, their geometry betraying the ice that made them. The fairy chimneys — columns of softer rock capped by harder resistant stone — appear in the badlands sections where differential erosion has been working the landscape for millennia.

The low exploitation of the geodiversity of this valley-oasis is striking given its exceptional landscape heritage. Visitor numbers remain low due to inadequate promotional tools and infrastructure.

— Academic mapping study of Aït Bou Oulli geoheritage, 2016

The valley also has diverse tangible cultural heritage spanning hundreds of years, including enigmatic rock engravings dating from 2,000 to 3,000 years, troglodyte caves and terraced agriculture landscapes, geomonuments including old cooperative storage and kasbahs. The rock engravings predate the Amazigh villages by centuries, made by people whose name and exact culture are still debated among archaeologists. The troglodyte caves — natural rock shelters adapted for human habitation — are the layer before that. The terraced fields and kasbahs of the current Amazigh communities are the most recent layer. In Aït Bou Oulli, these three eras sit stacked in the same landscape, readable in the same afternoon.

The total population is 7,753 inhabitants scattered in 45 villages. The most important villages are Tarbat-n-Tirssal and Igoulouane; the administrative centre is Abachkou. These communities are Amazigh Berber, Tachelhit-speaking, settled farmers in a landscape that has been farmed since at least the period of the rock engravings. The valley architecture follows the High Atlas tradition: pisé and adobe construction using local clay and stone, flat-roofed houses tiered up the lower slopes, granaries with carved wooden doors on the approaches to the villages, everything built from the materials the landscape provides and coloured the same rust-orange as the cliffs above.

The walnut trees that fill the wadi are the most immediate and striking feature of the valley floor. Unlike Aït Bouguemez's cultivated mix of vegetables, apple trees, and barley, Aït Bou Oulli's wadi is dominated by the walnut grove — thick, shading, turning brilliant yellow in autumn in a way that makes the colour contrast between grove and cliff even more dramatic. Local families tap the trees in late summer, and the walnuts are one of the valley's primary cash crops. In spring, the blossom on the almond trees that grow on the lower slopes above the wadi creates a brief window of white against the red rock that experienced trekkers describe as one of the more quietly beautiful sights in the central High Atlas.

The valley is accessible by asphalted roads from Beni-Mellal city through Azilal city over a distance of 174 km, or from Aït Bouguemez over a distance of 10 km. The second approach — arriving from Aït Bouguemez via the village of Agouti and then descending into the valley — is the more dramatic of the two, and the more logical if combining both valleys in a single multi-day trip. A short walk through Aït Bou Oulli, with its traditional red-hued houses among rolling red-dirt hills, before driving through the impressive 2,700-meter mountain col describes the standard circuit itinerary. The descent from the col into the valley is steep enough that a 4x4 is advisable in wet conditions, though the paved road is manageable in a standard car in good weather.

Gites in the valley are small and genuinely basic — a room, a shared meal, the silence of a High Atlas night at altitude. The most important logistical fact about visiting Aït Bou Oulli is that a local guide from the valley, hired in Abachkou or one of the main villages, is not optional for anything beyond a walk along the wadi floor. The geosites are unmarked, the rock engraving locations are known only locally, the paths through the badlands terrain are not on any digital map, and the mule trails that connect the upper cirques to the valley floor require someone who has walked them before. The guide fee — reasonable by any standard — is the most important investment in the experience.

1 — Aït Bou Oulli (also spelled Ait Bou Oulli, Ait Bou Ili, or Ait Boulli) is in Azilal Province, Béni Mellal-Khénifra region. It is administratively distinct from Aït Bouguemez (the Happy Valley) though the two valleys are connected by the road through Agouti village and are often combined in multi-day trekking circuits.

2 — Jbel M'Goun (4,068 m) is Morocco's second-highest peak after Jbel Toubkal (4,167 m), though its remoteness and the difficulty of its approach mean it receives a fraction of Toubkal's traffic. The standard ascent route passes through Aït Bouguemez; an alternative approach passes through or above Aït Bou Oulli.

3 — The UNESCO M'Goun Global Geopark, to which Aït Bou Oulli belongs, was designated in 2017 and is the first Geopark in Morocco, Africa, and the Arab world. Research papers published between 2016 and 2025 have proposed three geo-hiking circuits in Aït Bou Oulli as part of the Geopark's expanded development, though as of 2026 these circuits are not yet signposted or formally established on the ground.

4 — Snow depth in the valley can reach 60 cm between December and February, making access difficult and some trails impassable. The best trekking season is April through October, with spring offering almond blossom and summer greenery, and autumn delivering the walnut grove at its most vivid.