Port Balís is an artificial reef located in Mataro, Spain, offering a shallow marine environment suitable for beginners. The site sits at a depth of 2 to 3 metres, with an average depth of 2 metres. Divers can expect mild currents and visibility ranging from 5 to 15 metres. Access is via a shore entry, though caution is required due to sharp edges on the reef structure and active boat traffic near the harbour entrance. Facilities at the site include parking, toilets, showers, a cafe, and a dive shop providing air fills and boat charters.

La Xonimira is a reef site located in Mataro, Spain, suitable for beginner divers. The site features a reef structure with depths ranging from 9 to 13 metres, averaging 11 metres. Divers experience mild currents and visibility that varies significantly between 5 and 30 metres. Access is strictly by boat, and divers must remain vigilant for boat traffic during ascents and descents. The reef consists of sharp rock, requiring careful buoyancy control to avoid contact. Species recorded around this area include wrasses, scorpionfish, sea stars, common octopus, and Mediterranean moray, alongside various nudibranchs and flatworms.

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 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.

La Calzada is an offshore rock barrier located near Mataro, Spain. This reef site features depths ranging from 15 to 20 metres, making it suitable for intermediate snorkelers and divers. Access to the site requires a boat. Water temperatures fluctuate throughout the year, ranging from 13C in February to 26C in August. Facilities available in the area include parking, showers, changing rooms, air fills, equipment rental, and a dive shop. Due to the moderate currents and depth, this site is best suited for those with previous experience in open water environments.

Canons is a varied underwater site featuring a reef, wall, and canyon system located 1000 metres off the coast of Mataro. The topography drops from 8 to 40 metres, with an average depth of 20 metres. Divers encounter moderate currents that can strengthen within the canyon sections, requiring solid buoyancy control. Visibility typically ranges between 15 and 25 metres. The site is suitable for intermediate divers and supports night diving. Water temperatures fluctuate between 13 and 19 degrees Celsius throughout the year. Due to the significant depth and potential for strong currents, divers should monitor air supply and decompression limits closely while avoiding sharp coral and rocks.

El Fortí is a shallow rocky reef located at the northern end of Mataro. The site is defined by a rocky bottom situated near an old Civil War bunker, providing a habitat for various Mediterranean fish species. With depths ranging from 2 to 8 metres and an average of 5 metres, it is well-suited for beginners. Access is via the shore, and conditions generally feature mild currents. Facilities available at the site include showers, toilets, changing rooms, and a rinse station. Species recorded around this area include wrasses, scorpionfish, sea stars, and various molluscs such as the common octopus and Mediterranean moray.

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.