Spiaggia dei Pozzarelli in Porto Ercole is a reef site offering depths between 2 and 15 metres, with an average of 7 metres. Accessible by both shore and boat, the site features a rocky seabed suitable for intermediate divers and snorkellers. Visibility typically ranges from 10 to 25 metres, though conditions vary. Marine life recorded at the site includes wrasses, bream, crabs, and hermit crabs. Divers may also encounter Mediterranean moray, white-spotted octopus, common octopus, European common cuttlefish, Turkish wrasse, cleaner shrimp, fried egg jellyfish, scorpionfish, conger eel, and Cratena slug. Be aware of jellyfish as a potential hazard when diving or snorkelling in this area.

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 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.

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.

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.

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.

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.