Ruinas (Sardinian: Arruìnas) is a comune (municipality) in the Province of Oristano in the Italian region Sardinia, located about 80 kilometres (50 mi) north of Cagliari and about 25 kilometres (16 mi) east of Oristano.

Ruinas borders the following municipalities: Allai, Asuni, Mogorella, Samugheo, Siamanna, Villa Sant'Antonio, Villaurbana.

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