Sardinia has a 24,090 km2 surface, at the centre of the western Mediterranean; it is shaped as a rectangle (the ancients saw it shaped as a sandal) and faces a gulf on each side: the gulf of Cagliari to the south, that of Oristano to the west, that of Orosei to the east, and the gulf of Asinara to the north.

The territory is mainly mountainous; the highest peak - Punta Lamarmora - raises for 1834 metres at the centre of the isle, in the Gennargentu massif. The only plain is Campidano, which crosses the isle from west southwards, linking the gulf of Oristano to that of Cagliari.

In Sardinia, grey and cloudy days are very uncommon; precipitations basically occur between November and February and they are not very frequent.