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The GR20 is a **112-mile hiking trail through Corsica's interior** that is routinely described as Europe's toughest long-distance trek.[1][2] The trail typically takes 8–16 days to complete, with hikers covering an average of 6–9 hours per day over 16 stages.[2][4] Elevation gain totals approximately 43,000–46,000 feet across the route.[2][3] The optimal hiking season runs from late May through mid-October, with July and August being the busiest months.[2] Most hikers traverse north to south, encountering terrain that ranges from loose rock and snow to puddles, with daily ascents sometimes exceeding 1,000 meters.[1][4]
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