Rab [ɾâːb] (Arba, Arba, Arbe, Arbey) is an island in the northern Dalmatia region in Croatia, located just off the northern Croatian coast in the Adriatic Sea.
The island is long, has an area of and 9,328 inhabitants (2011). The main settlement on the island is the eponymous town of Rab, although the neighboring village of Palit has the biggest population. The highest peak is Kamenjak at 408 m. The northeastern side of the island is mostly barren, karst, while the southwestern side is covered by one of the last oak forests of the Mediterranean.
Ferries connect the island of Rab with the mainland port of Stinica and with the neighbouring islands of Krk and Pag. European Coastal Airlines offered multiple daily connections by seaplane from Rab to Zagreb and to Rijeka via Rijeka Airport in Omišalj on the neighboring island of Krk, until it ceased operations in 2016.
The island of Rab was first mentioned in a Greek source Periplus of Pseudo-Scylax (360 BC) and then by other Greek and Roman geographists by the name Arba. That name belonged to the Liburnians, so far the oldest known inhabitants of the island. Arba was also the name of the Liburnian settlement in the modern city of Rab. It is not certain how old this name is; it may be as old as the settlement, which means from the beginning of the Iron Age since the Liburnians did not build the city walls on the island. The Illyrian-Liburnian word Arb meant 'dark, obscure, green, forested'. Therefore, name Arba should be comprehended as a toponym meaning "Black island", due to the rich pine forests that once grew on the island.
After the 1st century AD, it was recorded by many other Greek and Roman authors by the names Arba and Arva.
Its Medieval Dalmatian speaking population used Arbe, Arbia, Arbiana, Arbitana and most frequently Arbum in the documents written in the Latin.
Arbe became also the Venetian name of the city in the 15th century when it fell under the authority of the Republic of Venice.
In Croatian it became Rab, a form which probably goes back as far as the 7th century when the Slavs began to settle on the island.