Minorca has about fifty underground caves and a dozen underwater caves, as well as around thirty chasms which are discovered every day.
They are formed by the effects of the water leeks from the rainfall on the calcareous terrain. We can experience these capriccios of Nature, whether at the calcareous area in the north(la mola de Fornells and Monte Toro) as in the south of the island, where they are more frequent to be found, on occasions land-sliding the sides of gorges. Some are impressive for their dimensions, such as the Es Coloms Cave, also known as the cathedral due to its huge size; it opens in a wall on the eastern flank of the Binigaus gorge.
The fauna inhabiting the Minorcan caves is of special interest, above all at those with sea water supply but no open connexion with the sea itself. Some of them can show unique crustaceous in this type of habitat.
Man's hand has also created, ever since the prehistoric period, caves, as well as the natural openings, creating artificial extensions of these caves designated to burial purposes. A chance to admire this type of cave settlement can be found at the idyllic Calascoves and Cala Morell.
Another characteristic environment in Minorca are the gorges, which cross from one side to the other, following a winding itinerary, the Miocene platform of the southern zone heading towards the coast. These geological formations can reach a number of kilometres in length and walls up to fifty metres high. Their origin is due to the process of the digging action of the water torrents, earth movements and variations of the Mediterranean sea level. The Minorcan gorges allows the view of startling sceneries and gather a flora of 220 species, of which 26 are endemic. They are also important nesting spots for water birds and birds of prey, being the kite an example of beauty and wonder.
The most outstanding of the roughly forty gorges to be found on the island is the d'Algendar Gorge for its incomparable beauty.