Cycling the GT20 in Corsica: complete guide to the great cycling traversal

Discover our detailed analysis of the GT20, the emblematic cycling route crossing Corsica from Cap Corse to Bonifacio over approximately 600 kilometres

Published on Saturday, April 12, 2026

The GT20 today establishes itself as one of the most emblematic cycling routes in the Mediterranean basin. This great traversal of Corsica connects the north to the south of the island of beauty, offering a complete discovery of the remarkable landscapes that build this destination's reputation. Between spectacular coastal roads, mythical mountain passes, perched villages and preserved mountainous zones, the GT20 constitutes a first-class cycling challenge.

This complete guide offers a detailed analysis of the GT20, its characteristics, its different formulas, its strengths and practical advice to organise this great Corsican traversal.

The GT20: general presentation

An emblematic cycling route

The GT20, also called the Great Traversal of Corsica, designates a road cycling route connecting the north to the south of the island. This official itinerary, promoted by Corsican tourism and operated by specialised local actors, proposes a structured discovery of the island through a route studied to combine landscape interest, cultural richness and sporting challenge.

The name GT20 refers to the French administrative region Corsica (number 20 for Haute-Corse and 2A for Corse-du-Sud). This denomination is also inspired by other great cycling traversals like the GT of the Massif Central or the Pyrenees Traversal.

Route characteristics

According to official sources, the GT20 presents several notable characteristics:

• Total distance of approximately 600 kilometres
• Classic breakdown into 12 stages
• Traversal from north to south of the island
• Traditional departure from Bastia or Cap Corse
• Arrival in Bonifacio at the extreme south
• Crossing of several major mountain passes
• Alternation between coastline and mountain
• Significant cumulative elevation gain over the entire route

These characteristics place the GT20 in the category of demanding great cycling traversals, comparable to Portugal's National 2 or other major European traversals.

Remarkable natural heritage

The itinerary crosses several exceptional sites, some of which are inscribed on the UNESCO World Heritage List. The Gulf of Porto, the Calanques of Piana and the Scandola Nature Reserve notably feature among the natural jewels encountered during the traversal.

To deepen your understanding of bike choice adapted to this type of adventure, consult our touring bike selection guide.

The different GT20 formulas

The complete GT20 in 12 stages

The classic formula proposes the complete traversal in 12 stages, with moderate daily distances allowing full enjoyment of landscapes and cultural discoveries. This approach particularly suits cyclists seeking a balanced experience between effort and touristic immersion.

The GT20 Sport in 6 days

A more sporting version condenses the traversal into approximately 6 days, with daily stages potentially reaching 125 kilometres and more than 2,000 metres of elevation gain. This intensive formula addresses experienced cyclists seeking a major challenge over a reduced duration.

This demanding format requires excellent physical preparation and good effort management over duration. To effectively prepare this type of intensive long-distance ride, consult our expert cycling resources on long-distance ride management.

GT20 North or GT20 South

For cyclists having less time or preferring to focus on part of the route, the itinerary can be split into two sections:

The GT20 North, generally from Bastia to Ajaccio, allows discovering Cap Corse, the Agriates desert, the Balagne and the western coast over approximately 8 stages.

The GT20 South, generally from Ajaccio to Bonifacio, proposes the discovery of southern Corsica with its contrasting landscapes between mountain and Mediterranean coastline.

GT20 in autonomy or with support

The logistical organisation of the GT20 can take several forms according to your preferences:

In complete autonomy with luggage, for cyclists seeking an authentic bikepacking adventure.

With luggage transfer organised by local operators, allowing riding with a lightened bike whilst preserving stage flexibility.

With complete accompaniment including reserved accommodation, luggage transfer, mechanical support and sometimes guiding.

The Corsica Cyclo GT20: the sporting event

An annual cycling race

The Corsica Cyclo GT20 constitutes the sporting event organised on the traversal. This cycling race covers nearly 600 kilometres in five stages, offering competitive cyclists a unique opportunity to cover the entire GT20 in an organised setting.

The event mobilises each year cyclists from numerous countries, attracted by the combination of major sporting challenge and discovery of an exceptional destination.

A condensed and demanding format

The five-stage format imposes significant daily distances, generally between 100 and 150 kilometres depending on stages. The cumulative elevation gain over the entire event represents a major challenge, with unavoidable ascents like Col de Vergio and Col de Bavella.

This sporting format remains reserved for well physically prepared cyclists, with solid experience of multi-day cyclosportives.

The major stages and regions crossed

Cap Corse: the mythical departure

The GT20 traditionally begins from Cap Corse or Bastia, offering a remarkable opening. This peninsula in the north of the island proposes spectacular coastal roads, with the characteristic villages of Centuri, Nonza and the wild landscapes of the western coast of the Cap.

The first stages allow apprehending the authentic Corsican atmosphere, before beginning the traversal itself.

Saint-Florent and the Agriates desert

The itinerary then crosses the Saint-Florent region, with the discovery of the Nebbio, Patrimonio and its renowned vineyards. The Agriates desert, a vast preserved zone with almost African landscapes, also constitutes a memorable moment of the traversal.

The Balagne: Calvi and L'Île-Rousse

The Balagne represents one of the most endearing regions of the traversal. This region of north-western Corsica proposes Calvi and its Genoese citadel, L'Île-Rousse and its beaches, as well as the characteristic perched villages (Sant'Antonino, Pigna, Corbara).

The Balagne roads combine cycling effort and cultural discovery with remarkable architectural heritage and renowned gastronomy.

The western coast: Porto and the Piana calanques

The arrival on the western coast probably marks one of the most spectacular moments of the GT20. The Gulf of Porto, the Piana calanques and the Scandola reserve compose a UNESCO ensemble of rare beauty.

The corniche roads offer exceptional views of the Mediterranean and the characteristic rock formations of this coast.

Col de Vergio: the highest point

Col de Vergio, culminating at 1,477 metres, constitutes the highest road point of the GT20. This major ascent from Porto represents a memorable cycling challenge, with significant elevation gain and sustained gradients.

The passage through Col de Vergio allows crossing the central and mountainous part of the island, offering landscapes radically different from the coast.

Corte and the Niolu: the mountainous heart

Corte, former historic capital of Corsica, and the Niolu region constitute the mountainous heart of the island. These interior zones offer a different cycling experience, wilder and more authentic, far from coastal tourist flows.

To effectively prepare the ascents encountered during this traversal, consult our cycling training camp preparation guide.

Ajaccio: the southern transition

Ajaccio, prefecture of Corse-du-Sud and Napoleon's birthplace, generally marks the transition between the northern and southern parts of the GT20. The city constitutes an important logistical stage, with numerous accommodations and services adapted to cyclists.

The Alta Rocca and Col de Bavella

The Alta Rocca represents the mountainous region of the south, with spectacular landscapes dominated by the Bavella needles. The Col de Bavella from Zonza constitutes another major ascent of the traversal, with an exceptional landscape setting.

Zonza, a characteristic mountain village, constitutes an appreciated stopping point to discover this authentic part of Corsica.

Porto-Vecchio and Bonifacio: the arrival

The final stages reach Porto-Vecchio then Bonifacio, offering a spectacular arrival at the extreme south of the island. Bonifacio, with its limestone cliffs and perched old town, constitutes a memorable finale for this great Corsican traversal.

Best periods for cycling in Corsica

Spring: the optimal period

Spring, from May to June, probably constitutes the ideal period to complete the GT20. Temperatures remain pleasant, nature explodes with colours as the maquis blooms and precipitation remains limited. Mountain passes become accessible again after the snowmelt.

This is the season privileged by most experienced cyclists completing this traversal.

Autumn: an excellent alternative

Autumn, notably September and October, also offers excellent conditions for cycling in Corsica. Temperatures become bearable again after intense summer, landscapes take on colour and tourist attendance decreases considerably.

Summer: to approach with caution

Corsican summer can be extremely hot, notably in coastal zones and the low interior. Temperatures regularly exceed 30-35°C, making certain stages particularly difficult. Summer tourist attendance also complicates logistics (accommodation, road traffic).

Cyclists considering a summer holiday must depart very early in the morning and privilege altitude zones, which are cooler. To prepare your rides in hot weather, consult our long-distance cycling nutrition guide.

Winter: variable conditions

Corsican winter remains mild in coastal zones, but mountain zones can receive snow. Col de Vergio and other altitude passages can be closed in case of significant snowfall. This season therefore doesn't suit the complete traversal.

Preparing your GT20: logistics and practical advice

Reaching Corsica

Corsica is accessible from mainland France by several means:

Ferry from Marseille, Toulon or Nice to Bastia, Ajaccio, L'Île-Rousse or Porto-Vecchio. This solution allows easy bike transport without disassembly.

Plane from major French and European cities to Bastia, Ajaccio, Calvi or Figari airports. Bike transport requires a box or adapted bag.

The choice between ferry and plane depends on your departure point and your logistical preferences.

Equipment choice

To approach the GT20 in road cycling, several material elements deserve particular attention. A classic road bike with gearing adapted to long ascents constitutes the logical choice. A 50/34 compact chainset paired with an 11-30 or 11-32 cassette allows comfortably approaching Corsican mountain pass gradients.

Equipment must also be adapted to significant climatic variations encountered during the traversal, between coastal heat and altitude freshness.

Accommodation along the route

The itinerary has a varied accommodation offering, particularly dense in coastal zones. Traditional stage points (Bastia, Saint-Florent, Calvi, Porto, Corte, Ajaccio, Zonza, Porto-Vecchio, Bonifacio) all offer accommodation solutions adapted to cyclists.

In high summer season, advance booking becomes essential due to high tourist attendance.

Mapping and navigation

Official GT20 GPS tracks are available on institutional sites and cycling platforms. The gt20-corsica.com site notably proposes the detail of the official route with regions crossed and main points of interest.

Komoot, Strava and RideWithGPS usefully complete available resources, with routes verified by the cycling community.

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Baroudeur Cycling: our flagship destinations

Our mainland France and Portugal expertise

At Baroudeur Cycling, our expertise focuses on mainland France and Portugal, where we have developed in-depth field knowledge of our routes. Corsica, although French territory, is not part of our operated destinations. This specialisation allows us to offer a level of service and quality that we could not guarantee on all destinations.

Portugal, our flagship programme

Our flagship programme in Portugal offers a complete discovery of this Mediterranean country with remarkable landscapes. Our National 2 traversal in Portugal notably represents a comparable experience to the GT20: a great cycling traversal of an entire country, with exceptional landscape richness and a major sporting challenge.

Also discover our Algarve road cycling holiday for a complete Mediterranean experience.

Explore all our Portugal cycling holidays to discover all the possibilities.

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Custom cycling trip

For cyclists seeking a personalised experience, our custom cycling trip service accompanies you in designing a unique project adapted to your desires, level and constraints, on our mainland France and Portugal destinations.

Bike rental and coaching

To effectively prepare your road practice, whatever your project, our cycling coaching programme offers physical preparation adapted to your cycling objectives.

If you wish to discover Portugal without transporting your equipment, our bike rental service offers quality road bikes adapted to all practices.

Alternatives and destination complementarity

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National 2 in Portugal as an alternative great traversal

If you seek a great cycling traversal with a French operator mastering all logistical aspects, our National 2 in Portugal constitutes a particularly relevant alternative. This complete traversal of Portugal from north to south proposes an experience comparable in ambition to the GT20, with the advantages of an accompanied premium service.

This complementary approach allows living several great Mediterranean traversals: the GT20 in Corsica with a local operator or in autonomy, the National 2 in Portugal with Baroudeur Cycling for an accompanied premium experience.

Conclusion: the GT20, an exceptional great cycling traversal

The GT20 establishes itself as one of the most fascinating great cycling traversals in Mediterranean Europe, offering a remarkable combination of landscape diversity, cultural heritage and major sporting challenge. Cap Corse, the Balagne, the Gulf of Porto, Col de Vergio, Corte, the Alta Rocca and Bonifacio compose a route of rare richness.

This traversal particularly suits experienced cyclists seeking an engaged adventure, with a strong sporting character and authentic immersion in deep Corsica. Preparation remains essential, notably concerning the period of the year, the chosen formula (complete, sporting, split) and logistical organisation.

If you seek an accompanied great Mediterranean traversal by an experienced French team, our National 2 in Portugal offers a particularly interesting alternative, with exceptional landscapes, ideal climate and premium service adapted to demanding cyclists.

Ready to live your next Mediterranean cycling adventure? Don't hesitate to contact us at Baroudeur Cycling to build together your next cycling project in Portugal, mainland France or for personalised accompaniment on our destinations.

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