Collinas, Forru in the Sardinian language, is a comune (municipality) in the Province of South Sardinia in the Italian region Sardinia, located about 50 kilometres (31 mi) northwest of Cagliari and about 9 kilometres (6 mi) northwest of Sanluri. As of 31 December 2004, it had a population of 954 and an area of 20.8 square kilometres (8.0 sq mi).
Collinas borders the following municipalities: Gonnostramatza, Lunamatrona, Mogoro, Sardara, Siddi, Villanovaforru.
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- ^ All demographics and other statistics: Italian statistical institute Istat.