El Dorado is a reef site located in Mataro, Spain, reaching depths of up to 22 metres. The site features a rocky substrate and reef structure that requires careful navigation due to variable visibility. Divers should expect mild currents, making buoyancy management relatively straightforward. Given the range of water temperatures from 13C to 24C, divers should select appropriate exposure protection based on the season. As facilities are limited, it is essential to confirm boat logistics and equipment availability with a local operator before arrival. Always carry a surface marker buoy, as surface conditions can change between dives.

L'Ancora del Negre is a wall and reef site located off Mataro, Spain, offering a deep-water experience for advanced divers. The topography features a rocky wall that descends to depths between 25 and 35 metres. Due to the significant depth, divers must maintain strict buoyancy control and adhere to decompression limits. Access is exclusively by boat, and conditions such as visibility can be variable. Divers should monitor their depth gauges closely throughout the dive to manage the primary hazard of depth. The site is suited for experienced divers capable of managing deep-water protocols in mild current conditions.

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.

El Pico is a reef site located off Mataro, Spain, accessible only by boat. The topography features walls and crevices that extend to a maximum depth of 27 metres. Divers should be prepared for moderate currents throughout the site, which can affect ascent and descent. Visibility is variable, and the use of a torch is recommended to inspect the deeper recesses and crevices along the reef structure. Due to the depth and current conditions, this site is suited for advanced divers. Water temperatures fluctuate between 13C and 23C depending on the season, requiring appropriate thermal protection for the time of year.

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.

Montseny is a reef site located off Mataro, Spain, accessible only by boat. The topography drops from the surface to a maximum depth of 27 metres. Divers encounter a mild current, making navigation manageable for those with intermediate experience. The site features a complex reef structure with crevices and sharp rock edges that require careful manoeuvring. Due to the presence of heavy boat traffic in the area, the use of a surface marker buoy is essential for all ascents. Water temperatures fluctuate between 13C and 23C throughout the year, necessitating appropriate thermal protection based on the season.

Acuari is a deep wall and reef site located off Mataro, Spain, characterised by a steep drop-off ranging from 30 to 45 metres. The site offers visibility between 20 and 40 metres, allowing divers to observe the wall structure. Due to the significant depth, this site is reserved for advanced divers with technical or deep diving certifications. Divers must manage bottom time and decompression obligations carefully to mitigate risks such as nitrogen narcosis. Access is by boat only, and water temperatures fluctuate between 13C and 19C throughout the year. A drysuit or a thick wetsuit with a hood is recommended for comfort during the typical 30-minute dive.

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.