Caletta Acquario is a sheltered cove in Ustica, Italy, providing an accessible environment for snorkellers. The site features a concrete platform that facilitates easy shore entry, making it suitable for beginners and families. The reef begins just a few metres from the shore, with depths starting at two metres. Conditions are generally mild, though water temperatures fluctuate throughout the year, ranging from 15C in the winter months to 28C in August. A cafe is available nearby for visitors. This site is well-regarded for snorkelling, offering a straightforward entry point into the Mediterranean marine environment.

Punta Cavazzi in Ustica is a volcanic site featuring a natural pool enclosed by cliffs, connected to the open sea by an underwater passage. The topography includes a reef and cave system suitable for beginners, with depths ranging from 1 to 24 metres and an average of 15 metres. Divers and snorkellers can expect mild currents and visibility between 10 and 25 metres. Entry is via the shore, and the site is well-suited for both diving and snorkelling. Water temperatures fluctuate between 15C and 23C throughout the year. As this site includes a cave, divers should be aware of the overhead environment hazard.

Secca d'Africa is a notable archaeological dive site located 3200 metres off the coast of Ustica, Italy. This offshore shoal features a rocky seabed characterised by natural arches and structures that serve as an underwater archaeological itinerary. Divers can explore historical remains, including Roman and Byzantine anchors scattered across the site. The topography ranges from 5 to 30 metres in depth, with an average depth of 18 metres. Access is strictly by boat due to the distance from shore. Conditions generally feature mild currents and visibility ranging between 10 and 30 metres. Divers should remain aware of boat traffic in the area.

Cala Sidoti is a shore-access reef located within the integral reserve of Ustica. The site features a shallow volcanic pebble seabed with depths ranging from 1 to 10 metres, averaging 5 metres. It is well-suited for beginners and offers a high-quality snorkelling experience. Conditions are generally mild, though visibility varies between 5 and 20 metres. Water temperatures fluctuate significantly throughout the year, ranging from 15C in winter to 28C in August. Divers and snorkellers should be aware of sea urchins present in the area. Equipment rental is available nearby to support visitors.

Scogli Piatti in Ustica is defined by its large, flat volcanic slabs that provide easy shore access for snorkellers. The site features a shallow seabed with depths ranging from 1 to 5 metres, averaging 3 metres. Visibility is variable, typically between 10 and 30 metres. Snorkellers can observe a variety of marine life, including common wrasses and less frequently encountered species such as Great Barracuda, Mediterranean Moray, European Parrotfish, and various groupers. Other inhabitants include rock cod, Turkish Wrasse, bream, Painted Comber, Madeira Rockfish, Sea Hare, Purple Sea Star, Castagnole, and Two-banded Seabream. Conditions are generally mild, making this a suitable location for beginners.

Sutta zia Lisa in Ustica, Italy, offers a diverse underwater landscape featuring a steep vertical wall, caves, canyons, and pinnacles. The site ranges in depth from 3 to 30 metres, with an average depth of 20 metres. Divers can explore fissures and boulder formations throughout the area. Access to this site is by boat only. Conditions are generally stable with mild currents and visibility ranging between 15 and 40 metres. Water temperatures fluctuate seasonally, reaching a high of 22C in October and a low of 15C during the winter months. This site is suitable for intermediate divers, with typical dive times lasting approximately 50 minutes.

Scoglio del Medico in Ustica, Italy, is a diverse marine site featuring volcanic topography including canyons, caves, walls, and pinnacles. Located 500 metres from shore, this site requires boat access and is suited for intermediate divers. Depths range from 10 to 35 metres, with an average of 30 metres. Divers may encounter species such as Great Barracuda, Mediterranean Moray, European Parrotfish, Groupers, Rock Cod, Wrasses, Flat Crab, Castagnole, Two-banded Seabream, Sea Hare, Purple Sea Star, Madeira Rockfish, Bream, and Painted Comber. Visibility varies between 10 and 35 metres. Be aware of overhead environments and moderate currents when planning your dive.

Secchitello is a prominent pinnacle and reef system located 1609 metres off the coast of Ustica, Italy. The site features large pinnacles rising from a depth of 50 metres to approximately 24 metres. Divers encounter a variety of marine life including Great Barracuda, European Parrotfish, Mediterranean Violet Aeolid, Cow Snail, and various wrasses. Other species recorded at the site include Mediterranean Cardinalfish, Bream, Painted Comber, Hermit Crab, Violescent Sea-whip, Purple Sea Star, Two-banded Seabream, Marine Goldfish, and hard coral. Due to strong currents and depths reaching 50 metres, this site is strictly for advanced divers. Boat access is required for this 30-minute dive, which offers visibility of 30 metres.