Cala Mariolu in the Orosei Gulf features a combination of reef and artificial reef structures. Snorkelling is best conducted around the large fallen boulders located in the centre and along the southern edge of the cove. The site reaches depths between 2 and 25 metres, with an average depth of 15 metres. Access requires a boat, and the site is suitable for intermediate snorkelers. Conditions include mild currents and visibility of 20 metres, though surf can be a hazard. Water temperatures fluctuate significantly throughout the year, ranging from 14C to 27C. The habitat supports a variety of Mediterranean reef fish and invertebrates.

Portu Pedrosu, located in the Orosei Gulf, is a site defined by limestone cliffs and a rocky seabed. The primary feature is a siphon accessible to advanced divers, which begins at a depth of 18 metres and extends for 20 metres before terminating at a window at 6 metres depth. Due to the overhead environment and moderate currents, this site requires boat access and is suited for experienced divers. The surrounding habitat supports a variety of Mediterranean reef fish and invertebrates. Divers should be aware of the overhead environment and potential for strong currents during their visit.

Piscine di Venere in the Orosei Gulf is a natural swimming pool characterised by freshwater springs emerging from the seabed, which produce a distinct iridescent blue colour. The site features a sandy bottom interspersed with limestone rocks and cave structures. Access is by boat only, and the site is suitable for intermediate divers due to the presence of overhead environments. Conditions include mild currents and water temperatures ranging from 14C to 27C. The habitat supports a variety of Mediterranean reef fish and invertebrates. Divers should be aware of potential hazards including overhead environments, sharp coral, and surf.

Cala Magroni in the Orosei Gulf offers a diverse underwater landscape featuring rock formations, a canyon, and a natural amphitheatre. Divers can explore a wall that leads to the Grotta della Sorgente, a cave with an entrance at 5 metres depth. The site reaches depths between 8 and 30 metres, with the amphitheatre peaking at 16 metres. Access is by boat only, and the site is suited for intermediate divers. Conditions include mild currents and water temperatures ranging from 14C to 23C. Due to the presence of an overhead environment within the cave system, divers should be aware of entanglement hazards.

Cala Biriola in the Orosei Gulf is a coastal site defined by a natural rock arch and a seabed composed of white pebbles and sand. This combination creates a bright environment with visibility ranging from 10 to 30 metres. The site features both reef and cave topography, making it suitable for intermediate divers and snorkellers. Access is available via both shore and boat. Conditions are generally mild, though divers should be aware of sharp coral in the area. Water temperatures fluctuate throughout the year, ranging from 14C in March to 27C in August.

Galleria is a cave and cavern dive site situated in the Orosei Gulf between Cala Luna and Cala Sisine. The site features a submerged gallery and various swim-throughs, making it suitable for beginner divers. Access is by boat only. Divers can expect depths ranging from 8 to 15 metres, with an average depth of 12 metres. Visibility typically spans 15 to 30 metres, though conditions include mild currents and an overhead environment. Water temperatures fluctuate significantly throughout the year, ranging from 14C to 26C, with common thermoclines often dropping temperatures to 15C at the 12-metre mark. Night diving is permitted at this location.

Nasello is a combined wreck and reef site located 1609 metres off the coast of Orosei. Divers encounter depths between 30 and 32 metres, requiring intermediate certification and careful management of bottom time. The site features mild currents and visibility ranging from 15 to 30 metres. Access is by boat only. Hazards include potential entanglement within the wreck structure, sharp coral, and stonefish on the reef floor. Thermoclines are common, with temperatures often dropping significantly below 12 metres. Due to the depth and varying water temperatures, a 7mm wetsuit with a hood or a drysuit is recommended outside of the summer months.

Isolotti dell'Ogliastra in the Orosei Gulf consists of granite islets featuring a topography of peaks, canyons, and posidonia meadows. This site is suitable for beginners, with depths ranging from 5 to 30 metres and an average depth of 20 metres. Access is by boat, located 1000 metres from the shore. Conditions vary, with visibility between 10 and 30 metres and mild currents. Water temperatures fluctuate between 15C and 22C throughout the year. Divers should be aware of sharp coral hazards. Facilities including air fills, guided tours, and equipment rental are available for visitors.