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.

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 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.

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.

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 Templo is a deep reef site located off the coast of Mataro, Spain. The reef structure extends from 25 to 35 metres, requiring advanced diving skills and careful gas management. Divers should maintain solid buoyancy control while navigating the rocky substrate. Visibility varies significantly, ranging from 6 to 21 metres depending on conditions. Water temperatures fluctuate between 13 and 20 degrees Celsius throughout the year, making appropriate thermal protection essential. Access to this site is strictly by boat, and divers must monitor bottom time and decompression requirements closely due to the significant depth. The site is best suited for experienced divers comfortable with deep-water environments.

El Turó Blau is a reef site located in Mataro, Spain, suitable for beginner divers. The reef structure extends from the surface to a maximum depth of 25 metres. Access to the site is by boat only. Divers encounter mild currents, though conditions vary between visits. Marine life frequently observed includes Mediterranean Moray, wrasses, scorpionfish, and various nudibranchs such as the Cratena Slug and Mediterranean Violet Aeolid. Other species recorded at the site include Common Octopus, Turkish Wrasse, and occasionally Slipper Lobster or Torpedo Ray. Water temperatures fluctuate between 13C and 23C throughout the year, requiring appropriate thermal protection during cooler months.

El Gruñon is a reef site located off Mataro, Spain, featuring depths between 14 and 23 metres. Accessible only by boat, the site offers visibility ranging from 5 to 25 metres. The topography consists of rocky reef structures and meadows of Posidonia oceanica seagrass. Conditions are generally manageable for beginner divers due to mild currents. Divers should exercise caution regarding buoyancy control, as the reef contains sharp and uneven rock formations. Water temperatures fluctuate significantly throughout the year, ranging from 13C in February to 23C in August and September, necessitating appropriate thermal protection for the season.