Terrain visibility analysis

Can you see Mont Blanc from Geneva?

Short answer: Yes, from this exact point in Parc de la Perle du Lac. The terrain does not block the line of sight towards the summit.

Mont Blanc is 69.9 km away, towards the southeast. From this exact lakeside point, no mountain blocks the view towards the summit.

View the calculation in Sightelo

Key figures

Observation point: Parc de la Perle du Lac lakeside, Geneva, Switzerland
Point of interest: Mont Blanc, France/Italy
Target elevation: 4,807.3 m
Straight-line distance: 69.9 km
Direction to the summit: 127.7° (southeast)

Terrain profile and line of sight

Detailed profile

Scroll horizontally to explore the full profile on a small screen.

Calculated terrain
Observer–summit sight line
Minimum visibility line
0 m reference (modelled curvature)

Terrain already includes modelled curvature and refraction (k = 0.13). The grey curve is the 0 m reference: subtract it from the terrain curve to read real elevation. Sight lines remain straight; no second curvature correction is applied. Vertical and horizontal scales differ.

At the summit, the target clears the modelled horizon by 316.5 m. No blocking terrain is calculated. The relief forming the horizon is 69.035 km from A.

The calculation models terrain, Earth curvature and standard atmospheric refraction. It does not model buildings, trees, clouds, haze or local atmospheric variations.

Calculated profile values

Distance (km)	69.9 km
Observer eye altitude	372.2 m
Summit altitude	4807.3 m
Minimum visible target altitude	4490.8 m
Target margin above the modelled horizon	+316.5 m
Minimum local sight-line clearance	+21.8 m
Displayed / calculated samples	498 / 701
Excluded around A / B	200 m / 799 m
Horizon-forming relief	69.0350 km

Audited calculation: 2026-10-11. The interactive calculator can recalculate with currently available elevation data.

Why can the summit be visible?

Between this point at Parc de la Perle du Lac and Mont Blanc, the terrain stays below the line of sight towards the summit. The landscape therefore leaves the view open in that direction.

Why might you still not see it?

The calculation applies only to the point shown and to an eye height of 1.7 m above the ground. It checks terrain, not the conditions on the day. Trees, buildings, haze or clouds can hide Mont Blanc. A different place in Geneva can also give a different result.

Technical details

Observation point coordinates: 46.220030, 6.153365
Summit coordinates: 45.832706, 6.865171
Terrain model: Copernicus DEM 90
Eye height: 1.7 m
Refraction used: Standard (k = 0.13)