First, here’s a quick overview:
The Grandes Randonnées trails, or GR, were born in France in 1947 thanks to an association of hiking groups who decided to mark out paths. This association was called the "Comité National des Sentiers de Grande Randonnée", the precursor to today’s Fédération Française de la Randonnée Pédestre.
Today, the combined GR trails in France span over 60,000 km, created and maintained by the Federation’s volunteer members. They are marked with a distinctive sign of two horizontal stripes: one white, one red.
One of the most famous Grande Randonnée trails is the GR20, which crosses Corsica. Renowned as one of Europe’s toughest hikes, it is undertaken in summer, between June and September.
To give some figures:
The GR20 celebrates its 40th anniversary this year and remains hugely popular, both among seasoned hikers and bold adventurers craving a challenge.
Its fame attracts 15,000 to 20,000 hikers annually. They come from across France and beyond to tackle 200 km of mountain trekking, following Corsica’s spine from Calenzana in the north to Conca in the south.
However, this hike is recommended only for reasonably fit individuals:
1,300m of elevation gain, 16 stages totalling 4–8 hours of walking per day (depending on difficulty), some verging on climbing. Expect ridge paths and altitudes over 2,000m.
While the record stands at around 32 hours for the full trek, an average hiker will need about 16 days—though many quit early. In fact, roughly 2/3 don’t complete the journey.
The main reason for abandonment is weather, highly unpredictable in Corsica’s highlands. It can become a major obstacle, with hikers facing fog, rain, or even summer snow.
Mountain huts offer bivouac or dormitory sleeping arrangements and supplies. Note: wild camping is strictly prohibited on the GR20—you must use designated areas.
Supply points are scarce, and though mountain guides oversee safety, you’ll need to complete stages self-sufficiently.
The route is demanding, so pack judiciously. Every extra kilo increases the difficulty of this already strenuous hike—a key cause of dropouts. You’ll still need food, ample water, and essentials like a first-aid kit, tent, sleeping bag, poncho, and spare clothes. Aim for a 70-litre rucksack.
The GR20 is ultimately a personal challenge that yields unforgettable memories. Breathtaking landscapes, trail camaraderie, rustic refuges offering respite, hidden paradises, and wildlife encounters... The GR20 isn’t a race. Take your time, and keep a journal to document your adventure.
You’ll return lighter in weight but rich in emotion—an intense, unforgettable experience.
If you’re not yet ready, build skills on gentler trails first.
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Below: The Record Video
