Cala delle Caldane is a reef site located on Giglio Island, characterised by granite rock formations that create a complex underwater landscape. The site features numerous crevices within the rock structure. With depths ranging from 1 to 10 metres and an average of 5 metres, it is well-suited for beginners and snorkellers. Visibility typically varies between 10 and 25 metres, and currents are generally mild. Access is available via both boat and a coastal trail. Equipment rental and first aid facilities are available for visitors. The water temperature fluctuates throughout the year, ranging from 14C in March to 26C during the summer months.

Cala dell'Olio is a rocky inlet situated beneath the Torre della Maddalena on the island of Giannutri. The site features a seabed composed of large boulders, creating a complex topography for exploration. Divers and snorkellers can expect depths ranging from 1 to 10 metres, with an average depth of 5 metres. Access to this site requires a boat. Conditions vary, with visibility ranging from 5 to 25 metres and mild currents. The water temperature fluctuates between 14C and 25C throughout the year. Due to the rocky environment, divers should be aware of sea urchins and sharp coral present in the area.

Cala Mar Morto on Giannutri is a shallow reef site defined by its calm waters, which are protected by a natural rock barrier and the nearby Isola Rossa. This site features shallow natural pools with depths ranging from 1 to 8 metres, averaging 4 metres. It is accessible via a shore entry and is suitable for beginners. Conditions are generally mild, with visibility typically between 5 and 15 metres. Water temperatures fluctuate seasonally, ranging from 14C in March to 25C in August and September. Parking facilities are available nearby. Divers should be aware of sharp coral present at the site.

Punta Secca is a wall and reef dive site located off the coast of Giannutri, Italy. The site features a significant depth range of 14 to 55 metres, with an average depth of 30 metres. Due to the depth and moderate currents, this site is suited for intermediate divers. Access is strictly by boat. Visibility typically ranges between 10 and 30 metres. Species recorded around this area include Mediterranean moray, common octopus, John Dory, scorpionfish, gorgon's head, various wrasses, and several species of sea slugs. Divers should be aware of the deep water and potential for strong currents during their descent.

Punta Scaletta, located on the northeast coast of Giannutri, is a site defined by a shallow plateau and a wall that drops to 55 metres. The site is notable for the remains of an ancient Roman shipwreck, with archaeological fragments visible from the surface due to the 30-metre visibility. Access is by boat only, and the site is suitable for beginners, though divers should be aware of the depth, potential for entanglement, and overhead environments. With an average depth of 25 metres and moderate currents, it offers a distinct experience for both divers and snorkellers.

Nasim is a deep-water dive site located off the coast of Giannutri, Italy. The site features a significant depth range of 45 to 60 metres, making it suitable for experienced technical divers. Access to the site is available via both shore and boat entries. Underwater visibility at Nasim varies between 10 and 30 metres depending on prevailing conditions. Water temperatures remain cool throughout the year, ranging from 14C to 17C. Due to the depth and environmental conditions, this site is intended for advanced divers with appropriate training and equipment for deep-water exploration.

Cala Maestra is a protected marine site located in Giannutri, Italy, offering a shallow environment ideal for snorkelling. The site features a combination of artificial reef structures, seagrass meadows, and natural reef formations. Divers and snorkellers can explore submerged Roman ruins near the shoreline alongside extensive Posidonia forests. Depths range from 1 to 5 metres, with an average of 3 metres. Entry is possible from both shore and boat. Conditions are generally mild with visibility fluctuating between 5 and 25 metres. Species recorded around this area include Mediterranean Moray, Common Octopus, Scorpionfish, John Dory, various wrasses, and several species of sea slugs.

Punta Pennello is a long rocky formation extending into the sea on the west side of Giannutri. The topography features a diverse landscape of boulders and seagrass meadows that serve as a nursery for juvenile marine life. Divers encounter a wall and reef environment with depths ranging from 5 to 50 metres, averaging 20 metres. Conditions vary, with moderate currents and visibility typically between 10 and 30 metres. This site requires boat access and is suited for intermediate divers. Hazards include potential entanglement, sharp coral, and strong currents. Snorkellers can also enjoy the site, which holds a rating of 4/5.