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 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.

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 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.

Negre Centre in Mataro, Spain, is a marine dive site featuring a combination of reef and wall topography. The site is suitable for intermediate divers and requires boat access. Depths range from 4 to 35 metres, with an average depth of 18 metres. Conditions at the site are variable, and divers should be aware of the potential for moderate to strong currents. Water temperatures fluctuate throughout the year, ranging from 13C in February to 20C between August and October. Due to the nature of the site and the presence of currents, it is recommended for those with appropriate experience.

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.

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 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.