Diving Dubrovnik - St. Mary’s Reef (Lokrum)
Site Overview
Dubrovnik - St. Mary’s Reef (Lokrum) is a reef dive site in Southern Dalmatia - Dubrovnik & Peljesac, Croatia, set in the clear, fish-rich waters of the Adriatic Sea. St. Mary’s Reef off Lokrum is a shallow coral garden ideal for beginners and night dives. Moray eels and octopus are common, making it a relaxed macro and training site. Its easy depth suits Open Water divers and fun dives. Visibility is good, and the short boat ride from Dubrovnik keeps it convenient. The island setting is scenic and close to the old town. It is a calm counterpoint to the deep Dubrovnik wrecks. Conditions are typical of the Croatian coast: visibility generally runs from 12 to 30 metres, the current is low and the water temperature ranges between 15 and 26 degrees Celsius depending on season and depth. The marine life is classic Adriatic, centred on mediterranean moray, common octopus, two-banded seabream, with the full community described below for those planning a dive. Because of its beginner rating and the need for Open Water certification, Dubrovnik - St. Mary’s Reef (Lokrum) is best approached with the right thermal protection and, where relevant, wreck or deep training. It is a representative example of why Croatian diving, with its wrecks, walls, caves and gorgonian forests, attracts divers who want history and Mediterranean life in equal measure.
Dive Briefing
"Entry is made by boat, with a transfer of about 10 minutes near Dubrovnik, and divers should check in with a local centre before entering the water. St. Mary’s Reef off Lokrum is a shallow coral garden ideal for beginners and night dives. Moray eels and octopus are common, making it a relaxed macro and training site. Its easy depth suits Open Water divers and fun dives. Visibility is good, and the short boat ride from Dubrovnik keeps it convenient. Plan your profile around a maximum depth of 20 m and an average of 10 m, keeping a close eye on gas and, in deeper sections, on the cold thermocline. Buoyancy control matters: silty or vegetated bottoms and submerged structures are easily disturbed, and shallow depth limits skills to shallow profiles is a real consideration here. Take a moment to review the site-specific hazards with your guide, because conditions at Dubrovnik - St. Mary’s Reef (Lokrum) can shift quickly with wind and tide and change the feel of the dive. A safe ascent with a surface marker buoy and a clear exit plan completes the dive, with emergency cover routed through Dubrovnik Hospital Hyperbaric Chamber."
Signature Marine Life
Mediterranean Moray
Muraena helena
Best: May, June, July
Common Octopus
Octopus vulgaris
Best: May, June, July
Two-banded Seabream
Diplodus vulgaris
Best: May, June, July
Small Red Scorpionfish
Scorpaena notata
Best: May, June, July
Mediterranean Nudibranch
Flabellina affinis
Best: May, June, July
Common Cuttlefish
Sepia officinalis
Best: May, June, July
Safety & Hazards
- Shallow depth limits skills to shallow profiles
- Occasional boat traffic near Lokrum
- Silt disturbance over sand
- Cold thermocline below the surface
- Snag on reef
- Busy in summer peak
Traveler Notes
Who is this for?
Dubrovnik - St. Mary’s Reef (Lokrum) suits beginner divers holding at least an Open Water certification, and it is a strong choice for those who enjoy the clear, fish-rich water of the Croatian Adriatic. Photographers, training groups and divers chasing wrecks, walls, caves or macro life will all find something here, provided they respect the temperature, the marine park rules and the limits of each site. It is less suitable for absolute novices unless booked through a centre running a supervised course, and the deepest or most enclosed sections should only be attempted with the correct specialist training and a guide. Planning a dive here with a licensed Croatian operator not only keeps you safe but also helps protect the fragile gorgonian forests, seagrass and wrecks that make the site special.
For Non-Divers
Lokrum island; Dubrovnik old town; City walls; Beaches
Quick Stats
Dive Logistics
- Dubrovnik Diving
- Korcula Divers
- Mljet Diving
- Lastovo Aquatic
Photography Info
Best for: macro, wide_angle
Nearby Stay
Hotel Excelsior
Dubrovnik • 10km away
Hotel Lapad
Dubrovnik • 10km away