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UpToWhere · Can you see it?

Can you see the Kunlun ridge on the India–China border from Pik Dankova, Tian Shan?

Yes — on the right day

536 km line of sight toward the south (bearing 170°), computed on 30 m Copernicus terrain with Earth curvature and standard atmospheric refraction.

This is the longest known line of sight on Earth: 536 km from Pik Dankova, across the entire Tarim Basin, to an unnamed ridge on the India–China border. Nobody has ever photographed it — and our 30-metre terrain model shows exactly how close the line runs.

3D terrain view from Pik Dankova, Tian Shan toward the Kunlun ridge on the India–China border
Straight-line distance536 km
Direction170° south
Observer eye level5,871 m
Target elevation6,340 m
Curvature drop at the target19,615 m
Hidden below the sightline8 m

Yes — but not on an ordinary afternoon. At standard atmospheric refraction the Kunlun ridge on the India–China border sits about 8 m below the grazing sightline from Pik Dankova, Tian Shan: over 536 km, Earth's curvature has dropped it 19,615 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 40 m clear of the horizon. Rare, real, and photographed.

A line like this is only ever seen under optimal conditions — clean high-altitude air and the assistive refraction of a cold, stable dawn. Our featured 360° analysis from this same summit finds a clear 508 km sightline into the Kunlun at standard refraction.

The line on the map

Satellite map with the sightline from Pik Dankova, Tian Shan to the Kunlun ridge on the India–China border drawn in red
The 536 km sightline over satellite imagery, drawn as the great-circle path light would follow.

The terrain profile

5,000 m10,000 m15,000 m normal dayinversion dayPik Dankovathe Kunlun ridge on the… 0 km536 km200400
Elevation profile from Pik Dankova, Tian Shan to the Kunlun ridge on the India–China border. Like every elevation profile, the vertical axis is stretched (≈15× here) — but the geometry is real: mid-path, Earth's surface genuinely stands 5,637 m above the straight line between the two points. 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 the Kunlun ridge on the India–China border to appear.
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Frequently asked questions

Can you see the Kunlun ridge on the India–China border from Pik Dankova, Tian Shan?

Yes — but only under exceptional atmospheric refraction. At standard conditions the summit hides just below the horizon across 536 km; during strong thermal inversions it lifts into view, and it has been photographed doing exactly that.

How far is the Kunlun ridge on the India–China border from Pik Dankova, Tian Shan in a straight line?

536 km great-circle distance, on a bearing of 170° (south).

What exactly blocks the view?

Earth's curvature. Over this distance the target drops about 19,615 m below a flat sightline and ends up roughly 8 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?

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