Isola Foradada is a limestone rock formation located 5000 metres from the shore near Alghero. The site features vertical walls and a sea cave, with depths ranging from 0 to 15 metres and an average of 14 metres. Access is by boat only. Conditions vary, with visibility between 5 and 25 metres and mild currents. The site is suitable for beginners and offers a 5/5 rating for snorkelling. Night diving is available. Species recorded around this area include wrasses, Mediterranean moray, common octopus, great barracuda, conger eel, various nudibranchs, and crustaceans. Be aware of boat traffic in the area.

Isola Foradada Dolmen is a diverse site in Alghero, Italy, featuring a combination of reef, wall, and cave topography. Divers can explore two large boulders that rise near the surface before navigating a short tunnel that transitions from 14 metres to 5 metres depth. The site is accessible by boat and is suitable for intermediate divers, with depths ranging from 5 to 30 metres and an average depth of 14 metres. Conditions include mild currents and visibility reaching up to 20 metres. Hazards to note include boat traffic, sharp coral, and surge. Night diving is permitted at this location, with typical dive times lasting approximately 50 minutes.

The Dolmen in Alghero, Italy, features a diverse underwater topography comprising a reef, wall, and cavern. Suitable for beginners, the site ranges from 5 to 30 metres in depth, with an average of 15 metres. Visibility typically spans 10 to 25 metres, supported by mild currents. Divers can access the site via shore or boat. Due to the depth profile, careful monitoring is required when exploring the wall and cavern sections. Surface conditions necessitate vigilance regarding boat traffic, and the use of a surface marker buoy is recommended upon ascent. Water temperatures fluctuate between 14C and 22C, making appropriate thermal protection essential depending on the time of year.

The Colonnade is a versatile dive site near Alghero, Italy, featuring a combination of wall, reef, and cavern topography. Divers navigate through a series of windows, swim-throughs, and arches that create distinct light effects. The site is accessible only by boat, located 1000 metres from the shore. With depths ranging from 5 to 18 metres and an average of 12 metres, it is suitable for beginners. Visibility typically spans 15 to 30 metres. A thermocline is present at approximately 12 metres, where temperatures drop to 15°C. Divers should be aware of sharp coral present at the site. Night diving is available, and typical dive times are around 50 minutes.

Cala Inferno is a marine site located beneath the white cliffs of Capo Caccia near Alghero. The topography features a dramatic underwater landscape composed of massive submerged boulders, walls, and caves. Access to this site is strictly by boat. Conditions vary, with moderate currents and potential surf, making it suitable for intermediate snorkelers. Water temperatures fluctuate throughout the year, ranging from 14C in the winter months to 26C in August. The site offers a distinct environment for those exploring the coastal features of the region.

Scoglio d'Inferno is a pinnacle reef near Alghero that breaks the surface. This site features two arches and reaches a maximum depth of 19 metres, with an average depth of 13 metres. It is suitable for beginners and offers mild currents. Divers frequently encounter white seabream, wrasses, and striped red mullet. Less common sightings include Turkish wrasse, bream, two-banded seabream, and salema porgy. Snails are also commonly observed on the reef. Access is by boat only, and divers should remain aware of potential boat traffic in the area.

Grotta di Nettuno is a complex site near Alghero featuring a combination of cave passages, vertical walls, and drop-offs. Divers typically explore depths between 20 and 30 metres, with visibility ranging from 10 to 30 metres. The site requires advanced open water and cave diving certifications due to the overhead environment within the cave system. Access is exclusively by boat, located 5000 metres from the shore. While currents are generally mild, they can strengthen, and divers must remain vigilant for boat traffic when surfacing. The water temperature fluctuates between 14 and 22C, though the interior of the cave remains a consistent 18 to 20C.

The Canyon in Alghero is a deep wall and canyon formation suited for advanced divers. The dive features a large archway at approximately 38 metres, leading into a canyon lined with gorgonian fans. Divers typically descend to an average depth of 30 metres, with the site reaching a maximum of 40 metres. Access is by boat only, and conditions involve variable currents with visibility ranging from 15 to 30 metres. Water temperatures fluctuate between 14C and 21C throughout the year. Due to the depth of the topography, this site is strictly for experienced divers holding a deep diver certification.