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UpToWhere · Can you see it?

Can you see Cap Blanc-Nez, France from the White Cliffs of Dover?

Yes — you can

34 km line of sight toward the southeast (bearing 135°), computed on 30 m Copernicus terrain with Earth curvature and standard atmospheric refraction.

The most-asked sightline question in Britain: stand on the white cliffs on a clear day and a low grey line appears across the Channel. That really is France — and the geometry says exactly how much of it you get.

3D terrain view from the White Cliffs of Dover toward Cap Blanc-Nez, France
Straight-line distance34 km
Direction135° southeast
Observer eye level107 m
Target elevation129 m
Curvature drop at the target79 m
Clearance margin+5 m

From the White Cliffs of Dover, at an eye level of 107 m, the sightline to Cap Blanc-Nez, France runs 34 km and clears every ridge in between. Over that distance Earth's curvature drops the target 79 m below a flat-earth line — but at 129 m, it still rises above the horizon. The view is geometrically real: whether you actually get it depends on haze, not terrain. The tightest squeeze is mid-path, where the sightline passes just 5 m above the terrain at km 34.

The line on the map

Satellite map with the sightline from the White Cliffs of Dover to Cap Blanc-Nez, France drawn in red
The 34 km sightline over satellite imagery, drawn as the great-circle path light would follow.

The terrain profile

-0 m250 m500 m750 m sightlinethe White Cliffs of Dov…Cap Blanc-Nez 0 km34 km102030
Elevation profile from the White Cliffs of Dover to Cap Blanc-Nez, France. Like every elevation profile, the vertical axis is stretched (≈15× here) — but the geometry is real: mid-path, Earth's surface genuinely stands 23 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.
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Frequently asked questions

Can you see Cap Blanc-Nez, France from the White Cliffs of Dover?

Yes. The terrain-limited line of sight is clear across 34 km, accounting for Earth's curvature and standard atmospheric refraction. Atmospheric haze is the only thing that can hide the view.

How far is Cap Blanc-Nez, France from the White Cliffs of Dover in a straight line?

34 km great-circle distance, on a bearing of 135° (southeast).

How much does Earth's curvature hide over 34 km?

At the target's distance the curvature drop is about 79 m: anything lower than that (relative to the observer's horizon plane) is hidden behind the bulge of the Earth. Cap Blanc-Nez, France is tall enough to rise above it.

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?

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