Collinas is a municipality in the province of Medio Campidano with about 1,000 inhabitants, in the Marmilla region.

The Monte Granatico building houses the Ethnographic Museum and is home to the ‘G. B. Tuveri’ Centre for Historical Studies. The archaeological heritage of Collinas is important. A short distance from the village, in the ‘historical forest’ of Santa Maria Angiargia, the remains of a Roman thermal complex have emerged, part of a villa that is currently being excavated.

On the road leading from the village towards the state road 131, it is possible to visit the Tomb of the Giants of ‘Sedda sa Caudeba’, around whose structure the remains of a Roman castrum can be seen.

On the Collinas-Siddi road is the ‘Sa Corona Arrubia’ natural history museum, connected to the summit of the Siddi giara by a chairlift that flies over the Mediterranean Geobotanical Park and the basaltic relief of ‘Sa Corona Arrubia’, which takes its name from the colonies of red lichens that proliferate there. The museum reproduces the natural environments of this area of the Campidano and uses three-dimensional reconstructions created in collaboration with top European specialists. It also houses the region’s largest collection of traditional Sardinian toys.