# Can you see the mountains from home?

In perfectly clear air, 56% of Romanians live in a town or commune from which at least one peak over 2,000 metres would be in view from the roof of a ten-storey block. Type where you live and the panorama below shows which.

## More than half the country has high mountains on its horizon

From the centre of 1,538 of Romania’s 3,181 communes, towns and cities, at least one peak over 2,000 metres would be in view in clear air, 30 metres above the ground. They are home to 10.6 million people, 56% of the population counted in the 2021 census.

The result moves little when the assumptions change. From 10 m instead of 30, the share is 53%. If the air bent light less or more than it usually does, the share would be between 54.9% and 56.2%. With the terrain drawn finely even far away, it would be 56.0%.

The map has two halves. The plains of Oltenia and the Banat face the Southern Carpathians, the highest in the country, with nothing in the way: from Drăghiceni and Valea Mare, in Olt County, 47 peaks over 2,000 metres would be in view from each. In Moldavia, no commune centre in the counties of Iași, Neamț, Bacău, Vaslui, Vrancea and Galați sees a 2,000-metre peak: the nearby mountains are lower (Ceahlău is 1,907 m), and the high ones stay below the horizon.

## From the Carpathians you can see the Balkans and the Tatras

The higher you stand, the farther the horizon. From the Carpathian ridges the line of sight crosses the plains and reaches the mountains of Bulgaria and Slovakia, more than 300 kilometres away. Between two peaks that far apart the Earth’s surface bulges: halfway between the Retezat and the Balkan Mountains, by 2,215 m. The air bends light towards the ground and makes it look like 1,927 m, and the line of sight passes only 456 m above the Romanian Plain.

### From the Retezat to the Balkan Mountains

From Peleaga (2,509 m), the highest peak of the Retezat, you can see Botev Peak (2,376 m), the highest of the Balkan Mountains, in Bulgaria. It clears everything in front of it by 450 m and stays in view however little the air bends light.

### From the Apuseni to the Tatras

From Vlădeasa (1,836 m) you can see Gerlachovský štít (2,655 m), the highest peak of the Carpathians, in Slovakia. It clears the ridges in front by 158 m; with a refraction coefficient of 0.07 instead of 0.13, the margin falls to 54 m. Halfway, the line of sight passes 255 m above the Pannonian Plain.

### The longest we found: from the Făgăraș to Musala

From Negoiu (2,535 m), Musala (2,925 m), the highest peak of the Balkan Peninsula, is 387 km away. The line of sight passes 85 m above the Romanian Plain and nearly touches a ridge in Bulgaria 71 km short of Musala. The summit clears it by 25 m, and only when the air bends light nearly as much as it does on average, or more; on a day with weak refraction it stays hidden.

### From Bucharest to Omu

From the roof of a ten-storey block in central Bucharest, Omu Peak (2,507 m) clears Coștila, which stands in front of it, by 30 m, 124 km away. It is the only line on this list that has been photographed, more than once.

## The calculation, set beside photographs

Where people have photographed or filmed very distant mountains, the calculation from the same spot shows nearly all the same peaks above the horizon; where it does not, the gap is a few tens of metres. The saying that you can see the Danube from Omu sits right at the limit of the calculation; the sea from Ceahlău does not show.

### ‘You can see the Bucegi from Bucharest’ — True

Photographed from the roof of the Intercontinental hotel, 75 m up, in October 2017 and February 2020, and from Militari between 2016 and 2019. The calculation from the same height: Caraiman clears by 129 m, Coștila by 78 m, Omu by 34 m. They are 119–123 km away, not the 100–110 km that was reported.

### ‘You can see Romania’s mountains from Poland’ — True

From Tarnica, in the Bieszczady, Vlădeasa was photographed 257 km away, in 2015 and in 2024. The calculation puts it 62 m above the horizon. Pietrosul Rodnei, photographed from the same spot, stays 183 m below the ridge in front of it in the calculation, mostly because distant terrain is drawn in large cells. On fine terrain it is 44 m short, which the air makes up when it bends light a little more than average.

### ‘You can see Ceahlău from Iași’ — Depends where

Filmed in October 2019; Toaca is 126 km from the city centre. From the centre the hills to the west hide it: Toaca stays 1,620 m below them. From Copou hill, 30 m above the ground, Toaca clears them by 203 m.

### ‘You can see the Danube from Omu’ — Marginal

Towards Giurgiu the water stays 44 m below the ridges in front of it. Towards Oltenița it clears them by 2 m at every refraction tried: right at the limit of the calculation.

### Can you see the sea from Ceahlău? — No

The nearest shore is 320 km away, in Ukraine; the nearest Romanian one 331 km. To rise above the horizon seen from Ocolașu Mare, the sea would have to be at least 2.4 km higher. The geographer Dinu Oprea says it might be possible in theory, but that he has never managed to see it.

## Why you don’t see them every day

The calculation says how far the line of sight reaches, not whether the air lets light through. Dust and water droplets scatter light, and a distant mountain grows paler until it cannot be told from the sky behind it. Contrast falls exponentially with distance; meteorologists call the distance at which a dark object is just visible against the sky the visibility.

In the SYNOP code in which weather stations send their observations, the top visibility step is ‘more than 70 km’. From Bucharest the Bucegi have been seen on days of very dry, clean air, usually after rain or wind, in winter but also in summer. The four images below show the same view from the place chosen above under four kinds of air. Why it is the air, not the Earth’s curvature, that usually hides them: The horizon that lies.

## How it was computed

**The terrain.** Terrain Tiles (Mapzen/Tilezen, on Amazon Web Services), a terrain model assembled from several sources, among them SRTM (NASA) and EU-DEM, sampled at about 110 m. Within 60 km of you the calculation uses cells of about 310 × 220 m; farther out, to 450 km, cells of about 925 × 650 m, each at the height of its highest point. Distant ridges between you and a peak therefore look a few tens of metres taller than they are: the calculation tends to hide peaks that are visible rather than show hidden ones. With fine terrain at every distance, the headline share would be 56.0%.

**Curvature and refraction.** For every direction, at every eighth of a degree, the calculation follows a ray out to 450 km and keeps the points that rise above everything nearer. It subtracts the Earth’s curvature and adds refraction: the air bends light towards the ground, and the calculation uses a coefficient of 0.13, the standard value in geodesy. The real coefficient changes from day to day; near the ground on sunny days it can be much larger, or even negative.

**Where you stand.** The centre of the seat of each commune, town and city, from Wikidata coordinates checked against GeoNames (89 points moved onto the seat), at the chosen height above the ground. The terrain model includes part of the height of buildings and forests, but not the block in front of you; that is why the national results are computed from 30 m and from 10 m, above the rooftops.

**The peaks.** Names and heights come from OpenStreetMap: 30,204 named peaks in Romania and the region, from the Tatras to the Balkans. Where OpenStreetMap gives no height or a plainly wrong one (459 of the peaks used), it comes from the terrain model; heights can differ by a few metres from other maps (Coștila is 2,498 m in OpenStreetMap, 2,490 m on Romanian maps). The panoramas show 5,286: those that rise at least 60 m above the saddle linking them to a higher peak, plus every peak over 1,800 m. A peak is in view if, at its height, it rises above the highest point between it and you. ‘Clears by 30 m’ means it could be 30 m lower and still be seen; under 30 m the result is marginal.

**The country.** All 3,181 administrative units, with population from the 2021 census. A ‘mountain’ here is a peak over 1,000 m that rises at least 100 m above its saddle. A commune’s whole population is counted at the point at its centre.

**What the calculation does not know.** The buildings, trees and poles around you; fog, cloud and haze; the day you look. It shows what the eye would see on perfectly clear air, from the chosen height.

## Sources

1. Terrain: Terrain Tiles (Mapzen/Tilezen) on Amazon Web Services, from SRTM (NASA), EU-DEM and other sources; full source attribution.
2. Peaks: © OpenStreetMap contributors, ODbL; named peaks in Romania and the region, extracted through the Overpass API as of 1 June 2026.
3. Population: National Institute of Statistics, 2021 Population and Housing Census, final results by administrative unit, via citypopulation.de.
4. Coordinates of commune and town seats: Wikidata. Borders: Natural Earth.
5. Refraction: C. Hirt, S. Guillaume, A. Wisbar, B. Bürki, H. Sternberg, ‘Monitoring of the refraction coefficient in the lower atmosphere using a controlled setup of simultaneous reciprocal vertical angle measurements’, Journal of Geophysical Research 115, D21102, 2010.
6. Visibility: World Meteorological Organization, code table 4377; H. Koschmieder, ‘Theorie der horizontalen Sichtweite’, Beiträge zur Physik der freien Atmosphäre 12, 1924.
7. The Bucegi from Bucharest: Digi24, 1 November 2017 and 14 February 2020; ‘În ce condiții se văd Munții Bucegi din București’, February 2020 (photographs by Dan Mihai Bălănescu and Adrian Botescu).
8. Romania’s mountains from Poland: dalekieobserwacje.eu, photographs from Tarnica on 31 December 2015 and on 10 January 2024.
9. Ceahlău from Iași: Ziare.com, 2 October 2019. What you can see from Ceahlău: Adevărul, 24 January 2019.
10. Retezat–Botev on a list of long lines of sight: Beyond Horizons (341 km).
11. The photograph near Sibiu: Saturnian, Wikimedia Commons, CC BY-SA 3.0.