GR10 or GR20: which one is really right for you?

In the world of trekking in France, two routes dominate the conversation and capture the imagination of experienced walkers: the GR10, the great traverse of the Pyrenees, and the GR20, the granite backbone of Corsica. Both promise total immersion in high mountain landscapes, but their characters are radically different. On one side, an epic journey from the Atlantic to the Mediterranean, shaped by valleys and a thriving pastoral culture. On the other, a rocky, technical and demanding challenge in the heart of the Island of Beauty. At Grand Angle, we have been walking these trails since 1983. To help you choose between these two giants, we have analysed their technical characteristics, their atmosphere and the physical demands they place on hikers.

GR10 or GR20: which trek should you choose for your next adventure?

• Pyrenean diversity and Corsican heights
• Difficulty and commitment
• Logistics and comfort
• When to go
• Which one is right for you?

Pyrenean diversity and Corsican heights

The GR10 is a celebration of geographical diversity. On this trek in the Pyrenees, you pass through a mosaic of habitats. From the sea-spray-battered Basque hills to the high peaks of Ariège, the scenery is constantly changing. The plant life is exceptionally rich: centuries-old beech forests, alpine meadows dotted with rhododendrons and wetlands where Pyrenean chamois make their home. The topography of the Pyrenees allows frequent descents to valley floors, bringing you close to local life and mountain heritage.

By contrast, the GR20 is defined by its stark rocky terrain and steep slopes. Here, granite dominates. This is a route of ridges and high plateaus, where the maquis gives way to a world of rock and deep blue mountain lakes. The sense of isolation is much stronger. Taking a trek in Corsica along the GR20 means accepting that you will stay “up high” for several days, with the Mediterranean Sea often visible on the horizon, reminding you that you are walking on a mountain in the sea. The atmosphere is more alpine, almost lunar in some northern sections.

Difficulty and commitment

Physical fitness is a crucial consideration for both of these routes, which are classified as challenging treks.

The GR10: a test of endurance

The GR10 covers approximately 1 100 kilometres with 55 000 metres of ascent. Although few hikers complete it in one continuous journey (allow around 50 days), every section demands a sustained pace. The main difficulty lies in the relentless climbs and descents: you often lose hard-earned elevation as you descend into a valley for the evening. This is a long-distance route that requires excellent physical fitness over an extended period. For those who would like a guided experience on some of the most beautiful sections, a guided walk between Collioure and Cadaquès offers an excellent taste of the final stretch of the adventure, where the mountain range plunges into the sea.

The GR20: a true test of technical skill

The GR20 is shorter (around 180 km), but its reputation as Europe’s toughest trek is well deserved. Here, the terrain is rugged: loose scree, slippery rock slabs and sections equipped with chains. You regularly need to use your hands for balance. The cumulative elevation gain is close to 12 000 metres, but it is the terrain underfoot that wears you out. The northern GR20 is particularly steep and rocky, while the southern section, although more wooded, remains demanding on the joints. For the best experience, many hikers now opt for a GR20 trek with luggage transfers and a guide to help them negotiate the technical sections safely.

Logistics and comfort

This is probably where the difference is most striking for travellers. The GR10 is “civilised”. It passes through many villages (Cauterets, Luz-Saint-Sauveur, Bagnères-de-Luchon), making it easy to stock up on supplies and offering a range of accommodation from hikers' hostels to charming hotels. This helps you pack your hiking backpack more effectively by keeping the weight of food down.

The GR20 requires more careful logistical planning. Apart from a few road passes (Vergio, Vizzavona, Bavella), you are far from everything. Wild camping is strictly regulated and is only permitted near the mountain refuges in the Parc Naturel Régional de Corse. Facilities are basic and spaces limited, making reservations compulsory. Managing your own food supplies is complicated, as shops at the refuges are few and far between and expensive. For those daunted by these logistics, agency-arranged self-guided trips provide guaranteed reservations and, often, luggage transfers at certain key points.

When to go?

High mountain weather leaves no room for improvisation. Summer is the standard season for both mountain ranges, but there are some differences:

• For the GR10: From mid-June to late September. Before June, the high passes in Ariège and the central Pyrenees remain snow-covered, requiring mountaineering equipment. September is often the most beautiful time, with low-angle light and pleasantly stable temperatures.
• For the GR20: From June to mid-October. In June, patches of snow can linger along the legendary GR20 route, particularly in the Cirque de la Solitude (now bypassed). In July and August, heat on the granite slabs and violent late-afternoon thunderstorms are the main risks.

Which one is right for you?

The final choice depends on what you are looking for beyond the physical challenge:

Choose the GR10 if: you enjoy varied landscapes, discovering local traditions and spending time in mountain villages. It is an ideal route for those who want to savour a long-distance crossing, rich in encounters and heritage. You can also consult our GR10 guide to plan your trek.

Choose the GR20 if: you are looking for an intense physical challenge and the stark beauty of rugged rock landscapes. This is the ultimate trek for steep terrain, ideal for those who enjoy scrambling over rocks and appreciate the distinctive camaraderie of remote mountain huts. Its toughness and wild beauty make it an adventure that leaves a lasting mark on a hiker’s life.

Whether you opt for the Pyrenean peaks or the Corsican ridges, an adventure like this requires thorough preparation. At Grand Angle, we put our first-hand knowledge of the terrain at your service to turn these challenges into exceptional experiences, whether on a self-guided GR10 trek or a guided GR20 traverse.