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.

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.

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.

Le Piramidi is a reef site located off the coast of Ustica, Italy. Accessible only by boat, this location is suited for intermediate divers capable of managing variable currents. The site features shallow depths throughout, which allows for extended bottom times to explore the reef structure. Water temperatures fluctuate significantly, ranging from 15C in the winter months to 28C during the summer. Because visibility and current strength can shift, conditions on the day of your visit will determine the character of the dive. Divers should verify boat departure times and local conditions with regional operators before planning their trip.

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.

Secca della Colombara is a prominent open-sea shoal located 500 metres off the coast of Ustica. This diverse site features a combination of reef, wall, and wreck topography, with depths ranging from 3 to 40 metres and an average depth of 20 metres. Divers and snorkellers can expect visibility between 15 and 30 metres. Due to the location, boat access is required, and visitors should be prepared for moderate currents, which can occasionally become strong. The site is suitable for intermediate divers and offers opportunities for night diving. Species recorded around this area include wrasses, Mediterranean moray, dusky grouper, and great barracuda.

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.