Croatia stretches along the eastern Adriatic, where limestone islands and sheltered channels create clear, boat-friendly diving for most of the year. Think rocky reefs, vertical walls, swim-throughs, and an outsized collection of wrecks from ancient trade routes to 20th-century conflicts. North hubs in Istria and Kvarner (Pula, Rovinj, Rijeka, Krk) lean into wrecks and easy shore entries, while Dalmatia (Zadar, Sibenik, Split, Vis, Hvar, Dubrovnik) adds offshore clarity, dramatic cliffs, and national-park seascapes like Kornati and Brijuni. Summer water typically reaches 22°C to 24°C with visibility often 15 m to 30 m, while winter is colder and windier, especially under the bora. Croatia is also rule-driven: independent scuba may require an individual authorisation, parks restrict where and how you dive, and protected cultural sites are only accessed through permitted dive centers.