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GR-121Long Distance Trail (GR)·Linear
GR-121. Etapa 14. Ugaldetxo-Aritxulegi
Hernani, Biscay
Moderate38.2/100Year-round
Distance
18.9 km
Est. duration
5h 23min
Elevation gain
+397 m
Elevation loss
-273 m
Highest point
828.4 m
Lowest point
46.2 m
Average elevation
476 m
Elevation profile
Flat (≤1%)Gentle (1–5%)Steep (5–10%)Extreme (≥10%)
Flat (≤1%)
Gentle (1–5%)
Steep (5–10%)
Extreme (≥10%)
Critical Segments
Demanding Climb
CAT 4
km 9.6 · 0.9 km Distance
17% Avg
407m – 564mSlope31% Max
RiskHIGH
Demanding Climb
CAT 3
km 12.6 · 0.9 km Distance
18% Avg
610m – 779mSlope30% Max
RiskHIGH
Dangerous Descent
km 18.0 · 0.9 km Distance
15% Avg
481m – 624mSlope28% Max
RiskHIGH
Demanding Climb
CAT 3
km 0.0 · 2.6 km Distance
12% Avg
47m – 363mSlope25% Max
RiskHIGH
Demanding Climb
km 2.7 · 0.6 km Distance
13% Avg
364m – 435mSlope24% Max
RiskHIGH
Demanding Climb
CAT 4
km 8.7 · 0.7 km Distance
13% Avg
325m – 415mSlope22% Max
RiskHIGH
Dangerous Descent
km 15.8 · 0.6 km Distance
18% Avg
721m – 825mSlope20% Max
RiskHIGH
Dangerous Descent
km 7.1 · 1.1 km Distance
11% Avg
338m – 458mSlope23% Max
RiskMEDIUM
7-Day Forecast
Slope distribution
Flat (≤1%)6%Gentle (1–5%)20%Steep (5–10%)27%Extreme (≥10%)47%
Child-friendlyNo
Pet-friendlyNo
- 👟Trail running shoesFootwearRecommended
- 🪄Trekking poles recommendedTrekking polesRecommended
- 💧Carry 4–5 L (no water sources on route)WaterEssential
- 🧴Sunscreen recommendedSun protectionRecommended
- 🗺️GPS or offline route downloadNavigationEssential
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About this trail
Senderos de Gran Recorrido (GR)
| Start municipality | Hernani |
| Region | Biscay |
| Source | Federación Española de Deportes de Montaña y Escalada (FEDME) |
| Start | 43.22416, -1.92540Open in maps |
| End | 43.27103, -1.79256 |
| Track points | 2,193 |