Playa el Portús is a coastal site in Cartagena featuring a mineral landscape of cliffs and golden sand. The underwater topography consists of rocky reefs, caves, and overhangs located approximately 50 metres from the shore. Depths range from 2 to 15 metres, with an average of 8 metres, making the site suitable for beginners. Conditions are generally mild with visibility between 10 and 20 metres. Access is via a shore entry. Divers and snorkellers should be aware of overhead environments within the caves and the presence of sea urchins on the rocky substrate. Facilities at the beach include parking, toilets, showers, a rinse station, and a cafe.

Cala Morena is a shore-entry reef dive located in Cartagena, Spain. The site features a reef structure that slopes from shallow depths down to 30 metres, making it suitable for beginner divers. Conditions are generally manageable, with mild currents and visibility ranging between 10 and 30 metres. Water temperatures fluctuate between 15 and 19 degrees Celsius throughout the year, necessitating the use of a 5mm wetsuit or thicker to maintain comfort. As facilities at the site are unconfirmed, divers should arrive prepared with their own water and supplies. This location provides a straightforward environment for those looking to build confidence in open water.

Cabo Tinoso is a boat-accessible site near Cartagena offering diverse topography including reefs, walls, drop-offs, caves, and artificial reefs. Depths range from 3 to 54 metres, with an average of 25 metres. Visibility typically spans 15 to 30 metres, allowing for clear observation of the varied underwater terrain. Water temperatures remain between 14 and 17 degrees Celsius throughout the year. The site is suitable for intermediate divers, though it presents hazards including deep water, overhead environments, and mild currents that may intensify. Night diving is permitted. Divers should plan bottom times carefully and monitor depth gauges, particularly when exploring the caves and wrecks.

Cala del Bolete Grande is a wild cove located in Cartagena, Spain, accessible either by boat or via a 2.5km hike. This reef site is suitable for advanced divers and snorkellers, offering an average depth of 5 metres with a maximum depth of 10 metres. Conditions at this location vary, and the site is noted for its remote, natural setting. Water temperatures range from 15C in the winter months to 26C in August. As a reef environment, it provides a habitat for regional marine life, though specific species observations are not recorded for this location.

Cuevas in Cartagena, Spain, offers a diverse underwater landscape defined by vertical walls and numerous caves and grottos. Suitable for beginners, the site features depths ranging from 12 to 23 metres. Divers access the site from the shore, encountering mild currents and visibility between 10 and 30 metres. Water temperatures fluctuate between 15C and 21C throughout the year, with potential for thermoclines or mixed fresh and saltwater within the cave systems. Hazards at this site include entanglement risks, overhead environments, and low visibility. The topography is composed of Triassic-age phyllite rock formations, characteristic of the Cabo Tiñoso coastal cliffs.

El Arco is a wall dive located near Cabo Tiñoso, featuring a distinctive stone arch formation. The site consists of a rocky massif extending perpendicularly from the cliff into the sea. Divers typically explore depths between 15 and 25 metres, though the arch itself sits in shallower water between 5 and 8 metres. Access is by boat, and the site is suitable for beginners. Conditions include mild currents and visibility ranging from 5 to 10 metres. Species recorded around this area include Mediterranean moray, common octopus, wrasses, bream, and sea stars, alongside various other Mediterranean marine life.

Cueva del Lago is a marine cave system located in Cartagena, Spain. This site is accessible only by boat and features depths ranging from 3 to 12 metres, with an average depth of 7 metres. As an overhead environment, it requires strict buoyancy control and the use of primary and backup torches. Conditions include mild currents and water temperatures fluctuating between 15C and 26C throughout the year. While suitable for beginner divers, the cave structure necessitates close adherence to guide instructions. Species recorded around this area include Mediterranean moray, common octopus, wrasses, bream, and various scorpionfish, though these are not confirmed sightings at this specific location.

El Muellecico in Cartagena is a wall and reef dive site named for a rock formation resembling a small pier. The topography features a rocky slope that descends vertically from 7 metres down to 30 metres, meeting sandy seabeds. The site consists of steep rock faces interspersed with gentle slopes of rubble and loose boulders detached from the cliff. Due to the depth and terrain, this site is suited for intermediate divers. Access is exclusively by boat. Divers should be aware of the depth and sharp coral formations present at the site. Conditions are generally characterised by mild currents, with water temperatures ranging between 15C and 19C throughout the year.