Circuit des 25 Bosses
Westray North Coast — Noup Head Loop
Circuit des 25 Bosses vs Westray North Coast — Noup Head Loop: Intensity Score Comparison
Both routes share a similar overall intensity (48 vs 49). Depending on personal strengths, the challenge relies more on Circuit des 25 Bosses's technicality versus the physical output of the other.
Model-based (not a field report) · Evaluates overall route demand, not danger.
The 'Circuit des 25 Bosses' (The 25 Bumps) is located in the Massif des Trois Pignons, on the western edge of the Forêt de Fontainebleau. Originally established in the 1970s as a training ground for alpinists, this technical 16km loop remains one of the most demanding day hikes in the Île-de-France region. The trail requires hikers to cross 25 distinct sandstone ridges, involving frequent scrambling over boulders and navigating deep sandy paths. It is an intense physical challenge characterized by constant elevation changes and a unique ecosystem of maritime pines and white sand dunes. Note: Compiled from public sources — not a field report.
Westray North Coast — Noup Head Loop
Located on Westray, one of the northernmost Orkney Islands, this coastal circuit offers a wild, remote walk culminating at the spectacular Noup Head Lighthouse. The route takes you along towering 76-meter sea cliffs that plunge straight into the swirling Atlantic, offering views of geos (narrow rock inlets), natural arches, and dramatic sea stacks. It is most famous as an RSPB nature reserve: during the early summer, the cliffs are a chaotic, deafening 'seabird city' home to tens of thousands of guillemots, razorbills, kittiwakes, and puffins.
Head-to-Head Metric Analysis
HikeMetrics Hazard Scale — Explanation
The HikeMetrics Hazard Scale is a proprietary 5-point classification system that evaluates hiking routes across five dimensions: physical demand, technical complexity, altitude exposure, weather risk, and rescue accessibility.
Unlike generic star ratings, the Hazard Scale is calibrated against altitude profiles, elevation gain per day, and logistical isolation factors — making it the most precise route classification system available.
Full Scale Documentation