Bisse de la Tsandra

MODERATE (2/10)

Aven → Roua

Distance

11.5 km

Ascent

+804 m

Descent

-313 m

Est. Time

3h 54m

Altitude

956.8–1,461.3 m

Type

point-to-point

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Bisse de la Tsandra is a 11.5 km point-to-point moderate hiking route in Switzerland, running from Aven to Roua. The route covers 804m of ascent and 313m of descent, with elevations ranging from 956m to 1,461m. Allow approximately 3h 54m for the full route.

The route is divided into 2 segments. The toughest stretch is the 7.9 km from Refuge d’ Airoz (Refuge d’ Aïroz) to Roua, climbing 461m (allow 2h 33m for this section). In contrast, the 3.6 km from Aven to Refuge d’ Airoz (Refuge d’ Aïroz) is much gentler.

With 80% of the route below 15% gradient, strong trail runners can maintain a good rhythm for much of the distance. The steepest pitches reach 39% gradient.

Budget roughly 2,080 kcal of energy expenditure and 2.3 L of water.

Low-altitude route (max 1461m). Hikeable most of the year.

Elevation Profile

Very Steep (>25%) Steep (15–25%) Moderate (10–15%) Flat (<5%) Easy (5–10%)

Route Map

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Trail Splits

Waypoint-to-waypoint breakdown with estimated hiking times (Naismith's Rule).

Segment	Dist	↑ Ascent	↓ Descent	Time	Cum. km
📍 Aven → Refuge d’ Airoz (Refuge d’ Aïroz)	3.6 km	+343m	-57m	1h 20m	3.6
🏠 Refuge d’ Airoz (Refuge d’ Aïroz) → Roua	7.9 km	+461m	-257m	2h 33m	11.5
Total	11.5 km	+804m	-313m	3h 54m	11.5

Pace & Fuel Calculator

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Fast Hiker / Jogger

Est. Finish Time

2h 29m

Calories

1,778 kcal

Water Needed

2 L

Effort Distance

21.1 km

flat-equivalent

🍫 Recommended: ~45g carbs/hr (112g total) 🧂 Electrolytes: ~1244mg sodium/hr

Terrain Analysis

Runnability

80%

Very Runnable

% of route below 15% gradient

Climb Ratio

70 m/km

Very steep profile

↑ 804m ↓ 313m

High Point

1,461.3 m

Mountain zone

Low point: 956.8m — Range: 504.5m

Surface & Technicality

Terrain Difficulty Breakdown

Runnable Flat (46%) Easy Grade (27%) Moderate Climb (13%) Steep (12%) Very Steep / Technical (2%)

🏃 Mostly runnable with gentle terrain. Great for fast trail running.

Sun Exposure

⛅ Partial Shade 30% exposed · 70% shaded

Route shade profile

Forest/shaded (70%) Open terrain (30%)

South-facing: 2% of route — mostly north-facing, less direct sun

🌲 Mostly shaded route. Good tree cover at lower elevations. Less sun exposure risk, but still carry sun protection for any exposed ridge sections.