The island is separated by a 16 km stretch of sea from the Argentario promontory. It is mainly mountainous and most of its surface is covered by Mediterranean vegetation comprising of large pine forests and numerous vineyards, for the production of the famous "Ansonaco" wine. The coast is 27 km long, made up of rocks, of smooth cliffs and several suggestive bays: Arenella, Cannelle, Caldane and Campese, the biggest one with its little homonymous village.
The island houses the remains of a Roman villa of Domitius Aenobarbus (1st-2nd centuries), in the area of Giglio Porto. No traces of the Temple of Diana once existing can be still seen.
Giglio's mild climate, unspoilt nature and pristine, emerald coloured waters, offer unforgettable holidays all year round.