Rab, Ital. Arbe, island (1991 pop. 9,205), 40 sq mi(104 sq km) off Croatia, in the Adriatic Sea. One of the Dalmatianislands, it is a popular seaside resort. Fishing and agriculture arethe main occupations. The island was under Venetian rule from the 10thcent. until 1797, and it retains its ancient walls, the ruins of thepalace of the Venetian governors, a 12th-century cathedral, and themedieval palace of the former archbishops.