Allume is a marine site located 500 metres off the coast of Isola del Giglio, featuring a combination of reef and cave topography. The site ranges in depth from 10 to 30 metres, with an average depth of 15 metres. Access is strictly by boat, and divers should be prepared for moderate currents that can strengthen without warning. The presence of an overhead environment within the cave system requires careful buoyancy control and air management. Visibility typically spans 10 to 30 metres. Water temperatures fluctuate between 14 and 20 degrees Celsius, necessitating a 5mm wetsuit in warmer months and a 7mm suit during the cooler periods from autumn through spring.

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 del Corvo is a cove on the west coast of Porto Ercole featuring a sea cave with a small internal beach. The site consists of underwater walls covered in sponges and corals, reaching depths of up to 40 metres with an average of 20 metres. Access is by boat only, and the site is suitable for advanced divers due to strong currents. Visibility ranges from 10 to 30 metres. Species recorded around this area include wrasses, Mediterranean moray, common octopus, and various nudibranchs. The site is also rated highly for snorkelling. Water temperatures fluctuate between 14C and 18C throughout the year.

Cala dell'Allume is a heart-shaped cove located on the west coast of Isola del Giglio. The site features a rugged seabed defined by mineral-rich rocks from a former pyrite mine, creating numerous crevices and caves. Water temperatures range from 14C to 26C, with underwater springs occasionally creating cold spots. Access is available from both shore and boat. Due to the presence of sharp coral and potential for entanglement, this site is recommended for intermediate snorkellers. Species recorded around this area include wrasses, Mediterranean moray, European common cuttlefish, and various octopus species, though these are not confirmed sightings at this specific location.

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.

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.

Punta del Faraglione is defined by a massive rock stack located at the southern tip of Campese Bay. This site features dramatic underwater topography, including a drop-off and rocky seabed that descends from 5 to 35 metres. Suitable for intermediate divers and snorkellers, the site offers both shore and boat access. Conditions vary, with visibility typically ranging between 10 and 25 metres and moderate currents present. Water temperatures fluctuate between 14C and 19C throughout the year. Divers should be aware of potential surf conditions at this location. Facilities including a cafe, dive shop, and equipment rental are available nearby.

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.