The GR R2 is a world-class traverse across Réunion Island, crossing UNESCO World Heritage volcanic landscapes.
Covering 140km with over 10,000 meters of cumulative ascent, it is an extreme physical challenge driven by verticality.
The trail navigates the three iconic 'Cirques' (Mafate, Cilaos, and Salazie), offering deep insight into the island's unique geology.
While primarily a rugged mountain trail (Class 2), the difficulty stems from relentless steep climbs on slippery volcanic rock and tropical humidity.
Hikers experience a total ecological transition from dense cloud forests to the high-alpine summit of Piton des Neiges (3,070m).
Overview
Technical Summary
The GR R2 is a legendary long-distance trail that traverses the French island of Réunion in the Indian Ocean from north to south. It is widely considered one of the most physically demanding GR trails in the French network due to its extreme verticality and tropical environment.
The scale of the Cirques. Dropping into Cirque de Mafate—the only place on the island accessible only by foot or helicopter—is a transition into a isolated volcanic environment. The sheer basalt walls rising thousands of meters above small villages (known as 'îlets') represent a significant geological feature.
Hazard Assessment
The trail features relentless, steep climbs and descents on slippery volcanic rock.
During the wet season (Jan-March), the island is prone to tropical cyclones and landslides.
The Expert Take
Success on this route requires balancing physical stamina with environmental awareness.Local conditions shift rapidly; always verify forecasts with regional authorities before moving to higher ground.
Stage Breakdowns
St Denis to Mafate
The northern ascent into the heart of the island. Crossing the Plaine des Chicots and dropping into the roadless Cirque de Mafate.
Cilaos & Piton des Neiges
Traversing the rugged Cirque de Cilaos known for its mountain peaks and lentils. Climbing to the roof of the Indian Ocean for a sunrise summit.
The Volcano (Piton de la Fournaise)
Crossing the Plaine des Cafres and entering the lunar landscape of the active volcano zone. Red sand and black lava fields.
Southern Descent
Dropping down through lush primary forests to the wild coast of Basse-Terre near Saint-Philippe.
Route
Geometry
Topographical Data & Reference Points
- Route Typehiking
- Highest Point3070m (High Variant)3070m
- Standard Transit Max2917m (Approx)
- Lowest Pointvalley floor elevation---
- GPS Location21.1140°S 55.4850°E
Technical Profile
Vertical Ascent Profile
An absolute roller-coaster. Over 140km, you'll gain over 10,000 meters in cumulative elevation. Expect multiple climbs of 1000m or more in a single day.
Terrain Characteristics
Rugged Mountain Trail (Class 2) — characterized by steep volcanic pathways, uneven rock steps, and occasional hand support; requires consistent balance.
The cumulative energy expenditure for GR R2 — La Grande Traversée represents a significant physical commitment. Success requires adequate preparation and moisture management.
Data referenced from regional park authority sources and topographic surveys.
Technical
Matrix Profile
The HikeMetrics Global Matrix provides an objective, multi-dimensional assessment of technical difficulty, exposure risk, and environmental load.
Risk Summary
Professional evaluation of route mechanics and environmental stress factors. Recommended for participants within specified technical scope.
This profile uses the HikeMetrics v1.0 risk matrix, prioritizing environmental stress and movement complexity over simple elevation metrics.
Technical Specs
Access & Logistics
Regulations
No permit for walking, but booking gites (lodges) months in advance is critical. Camping is restricted.
Seasonality
May to October is the austral winter—cool and dry. July/August is peak French holiday season.
Safety Index
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Next Operational Phase
Get Field Ready
Logistics & Permits
Verify all permit requirements and regional park access rules. High-season routes often require advance coordination for logistics.
View Requirements Protocol 02Field Preparation
Ensure equipment matches the technical demands of the specific terrain. Check current trail reports and humidity/wind variables.
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Core Concepts
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Route Questions
Is Mafate really accessible only by foot?
Yes. There are no roads into the Cirque. Everything (food, mail, supplies) is brought in by helicopter or carried on backs.
Do I need to speak French?
It helps, but most gite owners and hikers on the GR trails speak some English.
Dossier Verification & Sync
Data points indexed in this dossier are cross-referenced against authoritative land management records and regional mapping. HikeMetrics maintains independent verification protocols for all primary route geometry.