See Corsica from Nice

Can you see Corsica from Nice? It’s a question that often leads to the following answers:

• No, because of the Earth’s rotundity
• Yes, thanks to the refraction of light, a kind of mirage
• Yes, you can see all of Corsica.

In fact, the truth lies somewhere between these 3 statements.

See Corsica from Nice

The distant island and the roundness of the Earth

Corsica is located about 170 km from Nice as the crow flies and its first peaks are about 200 km away. At such a distance, even when you are in the heights of Nice, Corsica disappears well behind the curvature of the Earth. That’s physics and mathematics. BUT…

This data is calculated and verified at sea level. So you can’t see the foot of the island. However, in the north-western part of Corsica, the part facing Nice, mountains rise to 2300, 2500m and even Monte Cinto at 2706m.

Mathematically, the summit of Mont Cinto can be seen, in direct vision, if the observer is at an altitude of 28.52 meters. Therefore, in direct vision, the summits cannot be visible from the seaside, but beyond 28.52 meters, they can.

The heights of Corsica

There is another meteorological explanation that must be taken into account. Thus, under favorable conditions, we can distinguish the top of Corsica, let’s say, very approximately from 1500 or 2000 meters. Everything below this altitude disappears from our view, because of the Earth’s roundness.

The meteorological explanation

In meteorology, the Foehn and the Foehn effect are well known. This is the wind that blows over the mountains of Corsica. As it descends over the sea, it warms up and becomes more humid. The moisture thus reflects the Corsican coastline. This reflection, this “mirage” occurs at an altitude of about 1000m, following the curvature of the Earth. The rays are not straight (like those of light), but curved, making it possible to discern the relief of the island, despite the roundness of the Earth.

See the mathematical calculation here, in French, sorry.

The names of the Corsican mountains visible

The two islands to the east and the one to the west

The three “islands” (2 on the left, 1 on the right of the photo) are just 2300m peaks, so they’re visible. And the empty part has an altitude lower than 1800-2000m, so it doesn’t appear. So they’re not islands, but mountains in north-west Corsica.

What about the refraction of light then?

This well-known physical phenomenon must certainly play a part. Light propagating in curved lines across the surface of the globe should make the island appear a little closer than it is. But this “mirage” remains anecdotal.

The false Corsica from Nice

The island’s relief is easy to spot. Often, the image of Corsica is mistaken for mere fog. In which case, the relief doesn’t match and therefore, it’s not Corsica.

See Corsica from Nice

To distinguish Corsica from Nice, some conditions are necessary:

• The weather must be fine.
• The atmosphere must be dry, free of clouds, mists, suspended salt particles, etc.
• The period and time are important too.

When to see Corsica from Nice?

When to go?

Late autumn and winter are the best seasons to see Corsica from Nice, especially the sunny dawns of December, for example.

At what time?

The island can appear, depending on the time of sunrise, just before it appears on the horizon. The sky is illuminated, but the sun is not yet visible. As soon as it appears, the image fades very quickly and disappears rapidly, in 1 or 2 minutes.

Approximately, the island is visible 6 to 8 minutes just before sunrise and 1 or 2 minutes after sunset.