Cala dei Santi is a boat-accessible site located 500 metres off the coast of Giannutri. The topography consists of rocky reefs, Posidonia meadows, and small caves, offering a varied underwater environment. Divers can explore depths ranging from 5 to 23 metres, with an average depth of 15 metres. Conditions are generally mild, with visibility between 10 and 25 metres. The site is suitable for beginners, though the presence of small caves introduces an overhead environment. Dives typically last around 40 minutes. Facilities available nearby include air fills, equipment rental, showers, toilets, and gear storage. Night diving is permitted at this location.

Isolotto di Porto Ercole is a small island located 100 metres from the shore near Argentario. The site features a varied topography consisting of reefs, walls, and drop-offs. The side facing the open sea is characterised by rocky drop-offs, while the landward side offers shallower, calmer conditions. Depths range from 2 to 15 metres, with an average depth of 8 metres. Access is by boat only, and divers should be prepared for moderate currents and potential surge. The site is suitable for intermediate divers, with typical dive times of 60 minutes. Visibility varies between 5 and 20 metres depending on conditions.

Punta Finestra is a marine dive site located 500 metres off the coast of Giannutri, Italy. This site features a combination of cave, wall, and reef topography, requiring boat access. Divers can expect depths ranging from 15 to 28 metres, with an average depth of 25 metres. Conditions vary, with visibility typically between 5 and 20 metres and mild currents. The site is suitable for intermediate divers, with a typical dive duration of 45 minutes. Species recorded around this area include common octopus, Mediterranean moray, common lobster, wrasses, gorgon's head, flatworms, cow snails, cratena slugs, scorpionfish, sea stars, painted comber, yellow zoanthids, soft coral, and various snails.

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.

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 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.

Argentarola Caves is a complex site located 500 metres off the coast of Giannutri, Italy. The topography includes caves, reefs, walls, and drop-offs that range in depth from 4 to 50 metres, with an average depth of 25 metres. Access is by boat only. Conditions are generally mild, though visibility fluctuates between 10 and 30 metres. Due to the overhead environment and significant depths, this site is suited for advanced divers. Water temperatures remain cool, ranging from 14C to 18C throughout the year. Facilities available in the area include equipment rental, air fills, and guided tours.

Punta Sud is a reef wall located at the southern tip of Giannutri, Italy. The site features a slope that drops from 17 to 35 metres, with an average depth of 22 metres. Divers can access the site via boat or shore, though shore entries require caution due to potential surge and swell conditions near the rocks. Visibility typically ranges between 10 and 25 metres, and currents remain mild throughout the dive. Given the water temperatures of 14 to 19 degrees Celsius, appropriate thermal protection is recommended. Facilities including showers and toilets are available on site for post-dive use.