Ibiza (ēvēˈthä) [key], island (1990 pop. 33,776), 221 sq mi (572 sq km), Baleares prov., Spain, third largest of the Balearic Islands, in the W Mediterranean. The town of Ibiza is the capital. There are fisheries and saltworks on the island. Subsistence farming, aided by irrigation, is mostly terraced. A picturesque island with Roman, Phoenician, and Carthaginian remains, Ibiza attracts tourists and artists.