GR20 Northern Half (from North to South)

This section of the trail starts in Refuge d'Asco Stagnu (1422 m) and ends in Refuge de Tighjettu (1683 m). The highest point is La Pointe des Éboulis (2607 m).

Highlights:
- Monte Cinto (2706 m)
- Lac d'Argeritu (slightly off the route, below the GR20)
- La Pointe des Éboulis (2607 m, stony landscape)
- Bocca Crucetta (2452 m)

This section of the trail starts in Refuge de Tighjettu (1683 m) and ends in Refuge de Ciottulu di i Mori (1991 m). The highest point is Bocca di Foggialle (1962 m).

Highlights:
- Bergerie de Ballone (on route, food available, approx. 25 min from Tighjettu)
- Bocca di Foggialle (1962 m, rocky climb)
- View of the Paglia Orba (climbing not recommended, T5)

This section of the trail starts in Refuge de Ciottulu di i Mori (1991 m) and ends in Refuge de Manganu (1601 m). The highest point is Bocca a Reta (1883 m).

Highlights:
- Bergerie de Tula (ruins)
- View of Paglia Orba and Capu Tafunatu
- Petit Lac - Le Golo (perfect for cooling off)
- Natural pool further along the trail
- Wooden bridge over Le Golo
- Bergeries de Radule (great stop for a break)
- Forest section, small overlap with Mare à Mare trail
- Hotel Castel de Vergio (ideal for a break)
- Small chapel
- View of Grand Barrière
- Bocca a Reta (1883 m, sand/grass trail)
- Lac de Nino (lake surrounded by pastures and meadows — major highlight of the route)
- Bergerie de Vaccaghia (good place for a break)
- Bocca d'Acqua Ciarnente (gradual climb, easy-going trail)

This section of the trail starts in Refuge de Manganu (1601 m) and ends in Refuge de Petra Piana (1842 m). The highest point is Bocca a le Porte (2220 m).

Highlights:
- Bocca a le Porte (2220 m, steep and rocky ascent)
- Breche de Capitello (very steep climb, rocky, view on Lac de Capitello)
- Bocca a Soglia (2050 m, stony)
- Restonica Valley
- Col de Rinoso
- Bocca Muzzella (2210 m, rocky, hands required in parts)

This section of the trail starts in Refuge de Petra Piana (1842 m) and ends in Refuge de l'Onda (1430 m). The highest point is near Refuge de Petra Piana at the start of the stage.

Highlights:
- Bergeries de Gialgo (shortly after Refuge Petra Piana)
- Waterfalls along the route
- Forest section through the Ruisseau de Manganello Valley
- Cascades
- Manganello stream
- Bergerie de Tolla (perfect place for a break)

This section of the trail, and the last one of its northern section, starts in Refuge de l'Onda (1430 m) and descends to Vizzavona (920 m), which is the midpoint between the northern and southern halves of the GR20. The highest point is at 2141 m.

Highlights:
- Bocca du Porco (2159 m)
- Lac d'Oro (1970 m)
- Tattone
- Canaglia