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.

Spiaggia delle Caldane is a reef site located near Porto Ercole, Italy, featuring golden granitic sand and surrounding cliffs. The site is suitable for beginners, with depths ranging from 1 to 8 metres and an average depth of 4 metres. Access is available by both boat and foot. Conditions are generally mild, though current can vary. Species recorded around this area include wrasses, Mediterranean moray, common octopus, European common cuttlefish, and scorpionfish. Facilities at the site include equipment rental and a cafe. It is a highly rated location for snorkelling.

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.

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.

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 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.