Prvić (pronounced [pr̩̂v̞itɕ], or Parvić in the Chakavian dialect; Pervicchio in Italian) is an uninhabited island in the Croatian part of the Adriatic Sea, located in the Kvarner Gulf. It is the largest of the so-called Senj Islands, a group of small islands and islets located off the coast of the mainland city of Senj, lying between the larger islands of Krk and Rab. Other significant islands in the Senj group are Sveti Grgur and Goli otok, along with a number of islets and rocks, which are all uninhabited. Prvić has an area is 12.76 km², which makes it the 30th largest Croatian island, and its coastline is 23.12 km long.

Prvić is located southeast of Krk, separated from it by a 800 m wide Senj Passage (Senjska vrata) and it is geomorphologically considered part of the same landform as the Obzova hill, Krk's highest peak (578 meters above sea level), which forms the southwestern part of the Baška cove with the coastal town of Baška. Prvić's southernmost cape Šilo is 4 km away from the mainland as the crow flies and it is the point closest to mainland. Harbours nearest to Prvić are Sveti Juraj, a hamlet near Senj at the foot of the Velebit, and Baška on the island of Krk. The island itself is shaped like a steep cliff stretching northwest-southeast and is 7.4 km long. Its westernmost point is called Debeli Art and its northernmost point is cape Brezonjin, where an automatic lighthouse called Stražica is located.

Krk (pronounced [kr̩̂k]; Chakavian: Khark, German: Vegl; Latin: Curicta; Italian: Veglia) is a Croatian island in the northern Adriatic Sea, located near Rijeka in the Bay of Kvarner and part of the Primorje-Gorski Kotar county.

Krk has for many years been thought the largest Adriatic island, with an area of 405.78 km² (156.67 sq mi), although recent measurements now give the neighbouring island of Cres an equal surface area. Krk is also the most populous island, with numerous towns and villages totalling 17,860 (2001).

Archeological finds show that the island has been inhabited without interruption since the Neolithic age. According to Greek and Latin sources, Curicta (Krk) is one of the Apsyrtidian or Electridian islands held by the Liburnians. There are the remains of prehistoric settlements near Draga Bašćanska and Bronze Age and Iron age earthworks near Malinska, Dobrinj, Vrbnik and Baška.

Krk came under the Romans once they had defeated the Liburnians. The Town of Krk (Curicum) became a town with Italic law whose status evolved to give it the rights of a municipality. Nothing is known about the internal organisations of the town of Krk from this time. Near the present day Franciscan monastery the remains of thermal baths have been found. The defensive walls of Roman Curicum were amongs the most secure of all the towns on the Eastern Adriatic fortified by the Romans. Work began on their construction during the Civil War in Rome (50 BC) and they were further strengthened in the 60s of the 2nd century AD, to enable them to withstand attacks by the Quadi and the Marcamanni who were at that time threatening the Adriatic. Not far from Krk in 49 BC there was a decisive sea battle between Caesar and Pompey, which was described impressively by the Roman writer Lucan (AD 39–65) in his work Pharsalia. When the Empire was divided, Krk came under the Eastern Roman Empire.