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UpToWhere Can you see it?

Can you see Slieve Donard, Northern Ireland from Scafell Pike, England?

Yes, you can

179 km line of sight toward the west (bearing 261°), computed on 30 m Copernicus terrain with Earth curvature and standard atmospheric refraction.

The answer

Yes. Slieve Donard, Northern Ireland is visible from Scafell Pike, England across 179 km, looking down: Earth's curvature drops the target 2,178 m, leaving its top 2,307 m below eye level and still clear of the ground in between.

England's highest summit comes with a boast: on the clearest days you can see four countries: England, Scotland, Wales and Ireland. The Irish leg is the long one, all the way across the Irish Sea to the Mourne Mountains.

3D terrain view from Scafell Pike, England toward Slieve Donard, Northern Ireland
Straight-line distance179 km
Direction261° west
Observer eye level976 m
Target elevation847 m
Curvature drop at the target2,178 m
Below your eye level2,307 m

From Scafell Pike, England, at an eye level of 976 m, the sightline to Slieve Donard, Northern Ireland runs 179 km and clears every ridge in between. Over that distance Earth's curvature drops the target 2,178 m below a flat-earth line, but at 847 m, it still rises above the horizon. The view is geometrically real: whether you actually get it depends on haze, not terrain.

The line on the map

Satellite map with the sightline from Scafell Pike, England to Slieve Donard, Northern Ireland drawn in red
The 179 km sightline over satellite imagery, drawn as the great-circle path light would follow.

The terrain profile

0 m2,000 m4,000 m sea level (curved) sightlineScafell PikeSlieve Donard 0 km179 km50100150
Elevation profile from Scafell Pike, England to Slieve Donard, Northern Ireland. Like every elevation profile, the vertical axis is stretched (≈15× here), but the geometry is real: mid-path, Earth's surface genuinely stands 628 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 Slieve Donard, Northern Ireland from Scafell Pike, England?

Yes. The terrain-limited line of sight is clear across 179 km, accounting for Earth's curvature and standard atmospheric refraction. Atmospheric haze is the only thing that can hide the view.

How far is Slieve Donard, Northern Ireland from Scafell Pike, England in a straight line?

179 km great-circle distance, on a bearing of 261° (west).

How much does Earth's curvature hide over 179 km?

At the target's distance the curvature drop is about 2,178 m: anything lower than that (relative to the observer's horizon plane) is hidden behind the bulge of the Earth. Slieve Donard, Northern Ireland 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

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