Corsica is an island in the Mediterranean Sea, and is one of the 27 regions of France, although it is designated a 'Territorial Collectivity' by law, giving is a greater powers than the regions in mainland France. Before its conquest by France in 1769 it was Italian (Genoan, to be precise), and today it still retains many elements of Italian culture. Coincidentally, Napoleon Bonaparte was also born in the Corsican city of Ajaccio in 1769.
The population is about 322,000, almost the same as Iceland, but with an area of 3,350 square miles it has a population density of 96 people per square mile. That's over ten times greater than Iceland.
The island's climate, mountains, and coastlines make it popular among tourists, making this a major part of the economy. Indeed, a single chain of mountains make up two-thirds of the island. A trail crossing these mountains is designated the GR20 (GR = Grande Randonnee = long hike), and it is reputed to be one of the most arduous in Europe. The route runs from Calenzana to Conza, as shown by the red line below, and I intend to pursue it over roughly a two-week period in September.
