Balis 22 is a reef site located off Mataro, Spain, accessible only by boat. The reef structure extends from the surface to a maximum depth of 21 metres, making it suitable for beginner divers. Conditions are generally mild, with currents described as mild and visibility ranging between 15 and 30 metres. Water temperatures fluctuate significantly throughout the year, from 13C in winter to 24C in late summer, requiring appropriate thermal protection. Divers can explore the reef surface and its various crevices. Local facilities include a dive shop and equipment rental services, allowing visitors to source gear on-site.

El Tortu is a reef site located 1500 metres off the coast of Mataro, Spain. This site is suitable for beginners, featuring a consistent average depth of 10 metres. Access is exclusively by boat. Conditions vary, with visibility ranging from 5 to 25 metres and currents typically remaining mild. Water temperatures fluctuate significantly throughout the year, from 13C in February to 26C in August. Species recorded around this area include common octopus, Mediterranean moray, great barracuda, various wrasses, scorpionfish, and several nudibranch species such as the Mediterranean violet aeolid and Cratena slug. Divers should be aware of sharp coral present at the site.

El Negre Petit is a reef dive located off the coast of Mataro, Spain. The site features a reef structure that descends from 8 metres to a maximum depth of 25 metres, with an average depth of 18 metres. This site is suitable for beginners due to the mild currents and the ability to choose a depth that matches individual comfort levels. Visibility is typically around 9 metres. Boat access is required to reach the site, and local facilities provide air fills, boat charters, and guided tours. Divers should note that water temperatures fluctuate between 13 and 23 degrees Celsius throughout the year.

El Bosque is a marine dive site located in Mataro, Spain. The site features a consistent depth of approximately 9 to 10 metres. Conditions at this location vary throughout the year, with water temperatures ranging from 13C in February to 26C in August. Given the shallow depth profile, the site is accessible for divers of various experience levels. Access to the site is typically via boat, though local conditions should be checked prior to planning a dive. There is no specific data regarding marine life at this location.

Plaer del Vell is a reef site located off Mataro, Spain, accessible exclusively by boat. The reef structure extends from the surface to a maximum depth of 24 metres, allowing divers to select a depth profile suited to their experience level. Conditions are generally mild, with currents typically remaining light. Due to the nature of the site, divers must maintain awareness of boat traffic during surface intervals and ascents. The site is suitable for beginners, though constant monitoring of depth gauges is necessary given the reef topography. Water temperatures fluctuate seasonally between 13 and 23 degrees Celsius.

El Trompo is a reef site located 1000 metres offshore from Mataro, Spain. The reef structure ranges from 5 to 20 metres in depth, with an average of 12 metres. Visibility typically spans 10 to 25 metres. The site is accessible only by boat and is suitable for beginners, though divers should remain aware of boat traffic and potential current changes. The reef features Posidonia seagrass meadows which provide habitat for various reef fish and invertebrates. Species recorded around this area include common octopus, Mediterranean moray, wrasses, scorpionfish, and various sea stars. Night diving is permitted at this location. Guided tours and equipment rental are available through local facilities.

El Negre 15-22 in Mataro, Spain, offers a varied underwater landscape featuring a reef, wall, and drop-off. The site ranges from 4 metres to 27 metres in depth, with an average depth of 15 metres. Suitable for beginners, the site experiences mild currents and visibility between 5 and 30 metres. Access is by boat only, and guided tours are available through the local dive shop to help navigate the wall and crevices. Water temperatures fluctuate throughout the year, ranging from 13C in February to 23C in August and September. Divers should plan their thermal protection according to the seasonal temperature variations.

Reyes is a reef dive located 3000 metres offshore from Mataro, Spain. The site features a reef structure situated between 21 and 26 metres, with an average depth of 25 metres. Due to the depth, this site is suited for advanced divers who can manage decompression limits and buoyancy control. Access is by boat only, and the site experiences mild currents. Visibility is variable, ranging from 6 to 30 metres. Water temperatures fluctuate significantly throughout the year, from 13C in winter to 23C in summer. Night diving is permitted at this location. Local facilities include air fills, equipment rental, and guided tours.