Istria — Rovinj & Pula

Diving here runs off two land bases rather than one. On the Pula side, Orca sits below the hotels on the Verudela peninsula and dives its own house reef straight off the rocks, while Hippocampus works from Camp Stoja in Pula and from a second base near Fažana for Brijuni National Park. North of Rovinj, Starfish at Vrsar puts divers into its house bay a few steps from the door. The diving is run from shore and day boats, with the longest regular runs about thirty-five to forty-five minutes out to the Kamenjak sites, and the main season holds from 1 May to 31 October.

The rock does most of the shaping. Walls run long rather than deep — the face at Bumbište spreads over 200 m — and reefs step down in terraces, with the vegetated reef at Porer starting 8 m below the surface and dropping past 25, and the Rubin plateau beginning at 17 m before falling to 30 or 40. Tunnels cut the limestone at Fraskerić and shallow caves open at 3 to 8 m in Kamenjak. Growth is Mediterranean rather than tropical: yellow encrusting anemones and yellow sponges coat the San Giovanni Nord wall, and the Brijuni seabed carries sponges, shellfish, sea urchins and crustaceans.

It suits divers who want wrecks with history and enough shallow ground to fill the rest of the week, and it works for training — Villas Rubin beach averages 3.5 m and is used for Open Water courses and try dives. Two things are worth planning around. Pula and Rovinj/Vrsar are separate hubs some 26 to 31 km apart, each with its own centres, so a base commits divers to one side of the coast, though the Baron Gautsch sits roughly between them and is dived from both. High-season leisure-boat traffic also shuts a few sites, including Insel Katarina and Insel Faro, until the crowds thin.

Anyone whose main interest is sheer wall scenery will do better further down the Croatian coast in the Kornati, where the crowns drop past 80 m, and cave divers chasing one big system should look at Premuda's Cathedral instead. What Istria offers is variety within a short boat ride: a flagship wreck, two more within recreational range, caves and tunnels, a national park reef and a protected ria, plus a deep-wreck ladder for divers with the training — Rossarol at 49 m and Luana at 48 m — that begins where the recreational plan ends.