Numerous ferries connect the main coastal centres and their surrounding islands year-round, with services extended in the tourist season. Split is the main hub, with the other major ports being Dubrovnik, Šibenik, Zadar and Rijeka.
It's also possible to hire a yacht (with or without a crew) and explore under your own sail. Local boat-hire companies can be found in all of the main coastal towns, alongside the likes of UK-based Cosmos Yachting, which operates out of multiple ports.
Jadrolinija The main operator, with car ferries and catamarans on 35 different routes.
Kapetan Luka Daily fast boats on the Split–Hvar–Korčula route. From mid-April to October there is also a boat between Dubrovnik and Split, stopping at the islands of Mljet, Korčula, Hvar and Brač. From June to September an additional Dubrovnik–Split line also stops in Makarska.
G&V Line Has a daily catamaran between Dubrovnik and the islands of Šipan and Mljet. In July and August some boats continue on to the islands of Korčula and Lastovo.
Rapska Plovidba Services between Rab and the mainland and between Rab and Pag.