Secca della Croce is a seamount located 300 metres off Isola del Giglio, offering a varied topography that transitions from a shallow reef at 5 metres to steep walls and drop-offs reaching 45 metres. With visibility consistently around 30 metres, the site is suited for intermediate divers capable of managing strong currents. Access is by boat only, and a negative entry is required to avoid surface drift. Divers must monitor their depth closely and maintain situational awareness, as currents can shift in intensity and direction. A surface marker buoy is recommended for the ascent due to the potential for drift.

Secca dei Subielli is a boat-access reef and wall site located 1000 metres from the shore near Porto Ercole. The topography features a combination of reef and wall sections, offering intermediate divers varied terrain between 10 and 30 metres depth, with an average depth of 20 metres. Conditions are generally manageable with mild currents and visibility ranging from 10 to 25 metres. Water temperatures fluctuate between 14C and 20C, necessitating a 5mm wetsuit for most of the year. Species recorded around this area include wrasses, Mediterranean moray, European common cuttlefish, and various octopus species. Typical dive times are approximately 45 minutes.

Cala Cupa is a wall and reef dive site located 500 metres off the coast of Porto Ercole, Italy. The site features a depth range of 12 to 35 metres, with an average depth of 25 metres. Access is strictly by boat. Divers can expect mild currents and visibility ranging from 10 to 30 metres. Water temperatures fluctuate between 14C and 19C throughout the year. Due to the depth and the presence of sharp coral, this site is suited for intermediate divers. A typical dive lasts approximately 45 minutes.

Cala dell'Arenella is a shallow bay near Porto Ercole, Italy, characterized by a sandy center and a rocky perimeter. Featuring the notable Turtle Rock, the site offers depths ranging from 1 to 8 metres with an average of 3 metres. It is suitable for beginners and accessible via shore entry, with mild currents typically present. Species recorded around this area include wrasses, Mediterranean moray, common octopus, and various nudibranchs. Facilities at the location include parking, showers, changing rooms, a rinse station, equipment rental, and a dive shop. The site is well-regarded for snorkeling, with a rating of 4 out of 5.

Secca dei Pignocchi is an offshore reef and pinnacle system located near Porto Ercole. The site features a topography that rises to within 2 metres of the surface, with depths extending down to 35 metres and an average depth of 20 metres. Access is strictly by boat. Divers and snorkellers should be aware of strong currents present at this location. Water temperatures range between 14C and 19C throughout the year, with conditions in April reaching approximately 15.4C, which poses a risk of hypothermia during prolonged exposure. The site is suited for intermediate level divers due to the current and depth profile.

Caletta del Saraceno is a small cove located in Porto Ercole, Italy, notable for the submerged remains of an ancient Roman muraeum, or fish pond. This site is suitable for beginners, offering shallow depths ranging from 2 to 5 metres with an average of 3 metres. Access is via the shore, and the site features facilities including parking, showers, and changing rooms. Visibility typically fluctuates between 5 and 15 metres. The site is suitable for both diving and snorkelling, with night diving also available. Typical dives last approximately 30 minutes, and water temperatures vary throughout the year from 14C to 26C.

Torre del Campese is located at the northern end of Campese Bay near Isola del Giglio. This site features a combination of natural reef and artificial structures formed by the rocky foundations of the historic Medicean Tower. Snorkellers can access the water directly from the shore. Depths range from 1 to 40 metres, though the average depth is 1 metre, making it suitable for beginners. Conditions vary, with visibility typically between 5 and 25 metres and mild currents. Hazards include sea urchins, sharp coral, and surge. Facilities available at the site include parking, showers, and gear storage.

Punta Della Nave near Porto Ercole is a marine site featuring a combination of reef, wall, and pinnacle topography. Divers typically encounter depths averaging 21 metres. Access to this site is exclusively by boat. Conditions are variable, with visibility generally ranging between 15 and 25 metres and moderate currents present. Water temperatures fluctuate throughout the year, ranging from 14C in March to 23C in September. Due to the depth and current conditions, this site is suited for intermediate divers. Divers should be aware of sharp coral present in the area.