History of Sardinia strongholds on strategic points in the south and west of Sardinia, often peninsulas or islands near estuaries, easy to defend and natural harbours, such as Tharros, Bithia, Sulci, Nora and Caralis (Cagliari). The majority of the inhabitants in these cities were of indigenous nuragic stock while the Phoenician element was, although culturally predominant, in minority. The Phoenicians came originally from what is now Lebanon and founded a vast trading network in the Mediterranean. Sardinia had a special position because it was central in the Western Mediterranean between Carthage, Spain, the river Rhône and the Etruscan civilization area. The mining area
Sardinia mainland peninsula. The Strait of Bonifacio is directly north of Sardinia and separates Sardinia from the French island of Corsica. The coasts of Sardinia [ long] are generally high and rocky, with long, relatively straight stretches of coastline, many outstanding headlands, a few wide, deep bays, rias, many inlets and with various smaller islands off the coast. The island has an ancient geoformation and, unlike Sicily and mainland Italy, is not earthquake-prone. Its rocks date in fact from the Palaeozoic Era (up to 500 million years old). Due to long erosion processes, the island's highlands, formed of granite, schist, trachyte,