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 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.

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.

Cala dello Smeraldo is a rocky cove located near Porto Ercole, accessible via a steep staircase of 120 steps. The site features deep water and is suitable for intermediate snorkellers. Entry can be made from the shore or by boat. Water temperatures fluctuate throughout the year, ranging from 14C in March to 26C in July and August. Species recorded around this area include wrasses, Mediterranean moray, European common cuttlefish, and common octopus. Divers and snorkellers should be aware of sharp coral present at the site. Typical snorkelling sessions last approximately 15 minutes.

Le Scole is a group of granite islets located 800 metres from the shore near Porto Ercole. The site features a diverse topography including reefs, walls, and artificial structures, most notably a submerged statue of the Madonna, Stella Maris, positioned at a depth of 20 metres. Depths range from 25 to 60 metres, with an average of 25 metres. Conditions include mild currents and visibility between 10 and 30 metres. The shallower rocky areas are suitable for snorkelling, while the deeper sections are intended for intermediate divers. Boat access is required. Hazards include boat traffic, deep water, entanglement risks, and potential for strong currents.

Punta Di Radice is a reef dive site located near Porto Ercole in Italy. The site is accessed exclusively by boat and is suited for intermediate divers. The topography consists of a reef structure with an average depth of 20 metres. Visibility at the site varies between 10 and 30 metres depending on conditions. Water temperatures fluctuate throughout the year, ranging from 14C in March to 23C in September. As a marine reef environment, the site offers a typical Mediterranean underwater landscape for divers to explore.

Cannelle is a reef site located near Porto Ercole, Italy, featuring a sandy centre flanked by granite boulders at the north and south ends. This accessible shore entry site is suitable for beginners, with an average depth of 3 metres and a maximum depth of 5 metres. Divers and snorkellers can expect mild currents and visibility ranging from 10 to 25 metres. The site offers various facilities including parking, toilets, showers, equipment rental, and air fills. Water temperatures fluctuate throughout the year, ranging from 14C in March to 26C in July and August. Please be aware of sharp coral hazards when navigating the rocky areas.

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.