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.

Cala Spalmatoio serves as the primary landing point on Giannutri, offering a mix of artificial reef structures, seagrass beds, and historical interest. Divers and snorkellers can explore ancient Roman port remains located along the edges of the cove. The site features a sandy and pebble beach allowing for both shore and boat entries. Depths range from 2 to 20 metres, with an average of 5 metres, making it suitable for beginners. Visibility typically spans 10 to 25 metres, though users should remain aware of boat traffic in the area. Species recorded around this area include Mediterranean moray, common octopus, wrasses, John Dory, scorpionfish, and various sea slugs.

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.

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.

Giannutri is a protected marine area featuring seven distinct dive sites, including Gli archetti, Le macchine del Nasim, the Anna Bianca wreck, Punta pennello, Punta secca, Punta San Francesco, and Punta Ischiaiola. The topography encompasses reefs, walls, and drop-offs, with depths ranging from 5 to 55 metres and an average of 30 metres. Access is exclusively by boat, located 20 kilometres from the shore. Conditions are variable, with visibility between 10 and 35 metres and water temperatures between 14 and 17C. Due to the depth and potential for currents, this site is suited for intermediate divers. Hazards include boat traffic, decompression risks, and entanglement.

Cala Volo di Notte is a wall and reef site located on the island of Giannutri. The topography features high vertical walls that descend from 8 to 30 metres, with an average depth of 18 metres. Situated 100 metres from the shore, this site requires boat access due to the arduous nature of the surrounding cliffs. Divers can expect mild currents and visibility ranging from 10 to 25 metres. Water temperatures fluctuate between 14C and 19C throughout the year. The site is suited for intermediate divers, and the area is also suitable for snorkelling.

The Anna Bianca is a wreck site located 91 metres off the coast of Giannutri, Italy. Resting at depths between 33 and 52 metres, this site is accessible only by boat and is suited for intermediate divers with appropriate deep diving qualifications. Visibility is consistently 30 metres, allowing for clear views of the structure. The site features mild currents, though the depth requires careful planning to manage nitrogen narcosis and bottom time. Divers should avoid entering the wreck to prevent entanglement risks in the overhead environment. Water temperatures range from 14 to 18C, necessitating thermal protection. Species recorded around this area include Mediterranean moray, common octopus, wrasses, and various sea slugs.

Cala Ischiaiola, also known as The Arches, is a distinctive site located off the coast of Giannutri, Italy. This site features a complex topography of limestone walls, shallow caves, and natural underwater arches. With depths ranging from 2 to 10 metres and an average of 6 metres, it is well-suited for snorkeling. Visibility typically varies between 15 and 30 metres. Access to the site is by boat only, located 16 kilometres from the shore. Equipment rental is available for those visiting the area. The site is rated highly for snorkeling, offering an intermediate-level experience within the Tuscan Archipelago.