Platja de les Roques Blanques in Mataro is a shore-entry reef site featuring white rock formations that reflect sunlight across the seabed. The topography consists of a mix of sandy bottoms and rocky areas, suitable for beginners. Conditions are generally mild, though divers should be aware of potential surf and the presence of jellyfish. Water temperatures fluctuate between 13C and 26C throughout the year. Species recorded around this area include Mediterranean moray, common octopus, great barracuda, various wrasses, cow snails, flatworms, scorpionfish, and sea stars. Facilities at the site include parking, toilets, showers, a rinse station, a cafe, and equipment rental.

Las Milanas is a shallow marine dive site located off the coast of Mataro, Spain. The site maintains a consistent depth of approximately 9 metres. Water temperatures fluctuate throughout the year, ranging from 13C in February to 26C in August. Species recorded around this area include common octopus, Mediterranean moray, great barracuda, various wrasses, scorpionfish, and torpedo rays. Divers may also encounter Mediterranean violet aeolids, Cratena slugs, cow snails, flatworms, sea stars, and Mediterranean cardinalfish. Given the shallow depth, the site is accessible for divers of various experience levels.

El Santuario is an artificial wreck site located off the coast of Mataro, Spain. The site reaches a maximum depth of 23 metres and is accessible only by boat. Divers encounter mild currents and variable visibility, requiring careful buoyancy control and awareness of wreck penetration hazards. The structure features various recesses and encrusted surfaces that provide shelter for marine life, including moray eels, conger eels, octopuses, crabs, seahorses, and nudibranchs. Due to the depth and the nature of the wreck, this site is suited for intermediate divers. A torch is recommended to inspect the darker areas of the hull and crevices effectively.

Los Cubos is an artificial wreck site located off Mataro, Spain. The structure sits at depths reaching 25 metres, requiring advanced diving skills. Access is strictly by boat, and divers must remain vigilant regarding active boat traffic when surfacing. The site features mild currents, though visibility can shift significantly depending on local conditions. Divers should maintain precise buoyancy control to avoid contact with the artificial structure. Due to water temperatures ranging from 13 to 23 degrees Celsius, appropriate thermal protection is recommended, particularly during the cooler months. The wreck environment demands careful monitoring of depth gauges throughout the dive.

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.

La Avioneta is a wreck dive located off Mataro, Spain, resting at depths reaching 37 metres. This site is strictly for advanced divers due to the significant depth and the requirement for precise buoyancy control. Access is exclusively by boat, and divers should be prepared for mild currents. Visibility at the site varies considerably, so checking local conditions before departure is essential. Water temperatures fluctuate between 13C and 20C throughout the year, necessitating appropriate thermal protection such as a drysuit or thick wetsuit. Divers must maintain strict depth monitoring and careful gas management plans throughout the dive to account for the depth of the wreck.

Rincón del Corsario in Mataro is a reef and wall site that descends to a maximum depth of 29 metres. This site is suited for advanced divers due to the depth and the requirement for precise buoyancy control along the wall. Visibility is variable, ranging from 5 to 30 metres, and currents are generally mild. Boat access is mandatory for this location. Water temperatures fluctuate between 13C and 21C throughout the year, necessitating appropriate thermal protection. Night diving is permitted, offering a different perspective of the reef structure. Local facilities provide air fills, equipment rental, and guided tours to assist with logistics.

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.