GR 54

GR 54. Known as the Tour of the Oisans or the Tour of the Écrins, it is a classic, long-distance hiking circuit in the French Alps. The route circumnavigates the Massif des Écrins, the highest mountain range entirely within France, traversing the departments of Isère and Hautes-Alpes. Renowned for its challenging alpine terrain and spectacular glaciated scenery, the trail is a premier destination for experienced trekkers from around the world.

Overview

The circuit is a demanding high-mountain trek, typically requiring 10 to 14 days to complete, with significant daily elevation gain and loss. It is classified as a Grande Randonnée (GR) footpath, a network maintained by the French Federation of Hiking. The route is famed for its proximity to major peaks like La Meije and Barre des Écrins, and its path through the heart of Écrins National Park, one of France's ten national parks. Hikers encounter a variety of landscapes, from lush valleys such as the Vallée de la Romanche to high passes like the Brèche de la Meije and austere glacial basins.

Route

The traditional loop starts and finishes in the town of Le Bourg-d'Oisans, a major gateway in the Romanche valley. The standard clockwise itinerary proceeds through villages and mountain refuges including La Bérarde, a historic mountaineering center in the Vénéon valley, and Vallouise in the Gyronde valley. Key passes crossed include the Col du Souchet, Col de l'Aup Martin, and the Col du Vallon, each offering dramatic vistas. Variants exist, such as the challenging High Mountain Route (Variante Haute-Montagne) which involves glacier travel and technical sections near the Glacier de la Pilatte.

Geography and environment

The trail orbits the Massif des Écrins, a crystalline bedrock massif that is the core of the Dauphiné Alps. It lies entirely within the Écrins National Park, an area protecting exceptional biodiversity including species like the Alpine ibex, Alpine chamois, and the golden eagle. The geography is dominated by glacial features such as the Glacier Blanc and the Glacier de la Girose, and encompasses deep valleys carved by rivers like the Vénéon and the Drac. Notable natural landmarks along the path include the high-altitude Lac du Lauvitel and the towering north face of La Meije.

History

The development of the route is intrinsically linked to the history of alpinism in the Dauphiné region. The area around La Bérarde became a focal point for early climbers in the late 19th century, with pioneers like Pierre Gaspard achieving the first ascent of La Meije in 1877. The trail was formalized and waymarked as part of the GR network in the latter half of the 20th century, coinciding with the creation of Écrins National Park in 1973. It follows ancient pastoral and trade paths used for centuries between the valleys of Oisans and Briançonnais.

Tourism and access

The trek is a major draw for international hiking tourism, with infrastructure consisting of a network of mountain refuges like the Refuge du Soreiller and Refuge de l'Alpe de Villar-d'Arêne, and gîtes in villages. Access is primarily via Grenoble, with regular bus services to Le Bourg-d'Oisans operated by the Réseau interurbain de l'Isère. The best season is from late June to mid-September, outside of which high passes are often snowbound. Due to its difficulty, it is recommended for well-equipped hikers with prior alpine experience, and parts may require guidance from the Compagnie des Guides de l'Oisans.