Tratalias is a comune (municipality) in the Province of South Sardinia in the Island of Sardinia, located about 50 kilometres (31 mi) southwest of Cagliari and about 8 kilometres (5 mi) southeast of Carbonia.
Tratalias borders the following municipalities: Carbonia, Giba, Perdaxius, Piscinas, San Giovanni Suergiu, Villaperuccio. The former cathedral of Santa Maria di Monserrato is an example of Sardinian Romanesque architecture. Built in 1213–82, it has a façade with two rows of Lombard bands and a rose window. The interior has a rectangular plan with a nave and two aisles, and a semicircular apse.
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- ^ All demographics and other statistics: Italian statistical institute Istat.