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UpToWhere · Can you see it?

Can you see Pic Gaspard, French Alps from Pic de Finestrelles, Pyrenees?

Yes — on the right day

443 km line of sight toward the northeast (bearing 48°), computed on 30 m Copernicus terrain with Earth curvature and standard atmospheric refraction.

In 2016 a photograph taken between these two summits set the record for the longest line of sight ever captured on camera in Europe: 443 km from the Pyrenees to the Alps. Our terrain model can check the geometry behind the legend.

3D terrain view from Pic de Finestrelles, Pyrenees toward Pic Gaspard, French Alps
Straight-line distance443 km
Direction48° northeast
Observer eye level2,824 m
Target elevation3,786 m
Curvature drop at the target13,399 m
Hidden below the sightline217 m

Yes — but not on an ordinary afternoon. At standard atmospheric refraction Pic Gaspard, French Alps sits about 217 m below the grazing sightline from Pic de Finestrelles, Pyrenees: over 443 km, Earth's curvature has dropped it 13,399 m. During strong thermal inversions, though, the atmosphere bends light more sharply than the standard model (k ≈ 0.17 instead of 0.13) and the analysis flips — the summit lifts about 84 m clear of the horizon. Rare, real, and photographed.

Marc Bret's July 2016 photograph from this exact summit — the world record line of sight at the time — was taken at dawn under a strong thermal inversion: precisely the conditions this analysis says are required.

The line on the map

Satellite map with the sightline from Pic de Finestrelles, Pyrenees to Pic Gaspard, French Alps drawn in red
The 443 km sightline over satellite imagery, drawn as the great-circle path light would follow.

The terrain profile

5,000 m10,000 m sea level (curved) normal dayinversion dayPic de FinestrellesPic Gaspard 0 km443 km100200300400
Elevation profile from Pic de Finestrelles, Pyrenees to Pic Gaspard, French Alps. Like every elevation profile, the vertical axis is stretched (≈15× here) — but the geometry is real: mid-path, Earth's surface genuinely stands 3,850 m above the straight line between the two points (the dashed arc is sea level). Light bends only slightly around that bulge, so whatever it covers stays hidden. The amber ray is a normal day (k = 0.13) — it is cut off and continues as a faint ghost. The green ray is a strong thermal inversion (k = 0.17): it bends just enough around the planet for Pic Gaspard, French Alps to appear.
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Frequently asked questions

Can you see Pic Gaspard, French Alps from Pic de Finestrelles, Pyrenees?

Yes — but only under exceptional atmospheric refraction. At standard conditions the summit hides just below the horizon across 443 km; during strong thermal inversions it lifts into view, and it has been photographed doing exactly that.

How far is Pic Gaspard, French Alps from Pic de Finestrelles, Pyrenees in a straight line?

443 km great-circle distance, on a bearing of 48° (northeast).

What exactly blocks the view?

Earth's curvature. Over this distance the target drops about 13,399 m below a flat sightline and ends up roughly 217 m below the horizon. Only exceptional atmospheric refraction can (sometimes) lift it into view.

How was this calculated?

UpToWhere walks the full terrain profile between the two points on 30 m-resolution Copernicus GLO-30 elevation data, applying Earth curvature and standard atmospheric refraction (k = 0.13) — the same physics surveyors use. You can run the same point-to-point check between any two places on Earth.

More famous sightlines

Wondering about a different pair?

The free calculator shows how far you can see from any point on Earth. Pro adds point-to-point checks — this exact analysis, between any two places you choose.

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