Villamar, Mara (Marsh) de Arbarei in sardinian language, is a comune (municipality) in the Province of South Sardinia in the Italian region Sardinia, located about 45 kilometres (28 mi) northwest of Cagliari and about 7 kilometres (4 mi) northeast of Sanluri. Villamar borders the following municipalities: Furtei, Guasila, Las Plassas, Lunamatrona, Pauli Arbarei, Sanluri, Segariu, Villanovafranca.