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rugged, mountainous island in the Adriatic Sea that is part of Croatia. With an area of 153 square miles (395 square km), Brac is one of the larger islands in the Adriatic; it lies southeast of the mainland city of Split. Its maximum elevation, 2,559 feet (780 m), is reached at Vidova Mountain, the highest point in the Adriatic islands. The main occupations of the inhabitants are fishing and agriculture; crops include figs, olives, almonds, and wine grapes. With insufficient fresh water, the island must be supplied from the mainland in summer. Mechanized quarrying of marble provides a further export, and a small tourist industry has developed