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.

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.

Cala Goloritzé is a protected National Monument in the Orosei Gulf, offering a peaceful snorkelling environment. The site features a reef with depths ranging from 5 to 15 metres, averaging 10 metres. Snorkellers access the water from the shore, with the site located 250 metres from the coastline. Boats are required to remain 300 metres offshore. Visibility typically reaches 15 to 25 metres. Divers and snorkellers should be aware of underwater karst springs that cause sudden, significant drops in water temperature, sometimes up to 10°C colder than the surrounding sea. Due to these temperature fluctuations and the nature of the site, it is best suited for advanced snorkellers.

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.

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.

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 Luna in the Orosei Gulf is a marine site featuring a combination of reefs, caverns, and caves. Divers can explore various swim-throughs, including specific routes designed for sidemount configurations. The site is located 5000 metres from the shore and requires boat access. Conditions vary, with visibility ranging from 10 to 25 metres and mild currents. Depths typically average 14 metres, with a range of 8 to 12 metres. Due to the overhead environment, halocline, and potential boat traffic, this site is suited for intermediate divers. Facilities available at the location include a cafe and toilets.