Korčula is a Croatian island in the Adriatic Sea. It has an area of 279 km², is 46.8 km long and on average 7.8 km wide, and lies just off the Dalmatian coast. Its 15,522 inhabitants make it the second most populous Adriatic island after Krk. The population are almost entirely ethnic Croats. The island is twinned with Rothesay in Scotland. It is known for Grk, …Korčula is a Croatian island in the Adriatic Sea. It has an area of 279 km², is 46.8 km long and on average 7.8 km wide, and lies just off the Dalmatian coast. Its 15,522 inhabitants make it the second most populous Adriatic island after Krk. The population are almost entirely ethnic Croats. The island is twinned with Rothesay in Scotland. It is known for Grk, a white wine that is only produced here and not exported due to limited production.