Playa Mellizas in Cartagena features two distinct stone spires rising from the seabed, surrounded by a rocky wall. This reef site is suitable for beginners, with depths ranging from 5 to 30 metres and an average depth of 15 metres. Access is by boat only. Divers should be aware of variable visibility between 5 and 25 metres and the potential for strong currents, though conditions are generally mild. Water temperatures fluctuate between 15C and 19C throughout the year. On-site facilities include a cafe and toilets.

Cabeza del Caballito in Cartagena, Spain, is a diverse dive site featuring a combination of cave, pinnacle, and reef topography. Known locally as the Head of the Horse, the site serves as the North Gate entrance to the Cathedral. Divers can explore depths ranging from 3 to 30 metres, with an average depth of 18 metres. Access is by boat only, located 4000 metres from the shore. Conditions include mild currents and visibility between 10 and 30 metres. Due to the presence of an overhead environment, deep sections, and potential for current, this site is suited for intermediate divers. Typical dive times are approximately 45 minutes.

La Losa del Payo is a reef site located in Cartagena, Spain, accessible only by boat. The topography features a depth range of 6 to 33 metres, with an average depth of 20 metres. Divers should be prepared for strong currents, which are a notable hazard at this location. Due to the challenging current conditions, this site is suited for intermediate divers. Water temperatures fluctuate between 14C and 18C throughout the year. As a boat-based dive, it requires appropriate planning and local support to navigate the underwater terrain safely.

La Catedral is a boat-access site featuring a complex reef, wall, and cave system. Located near Aguilas and Calabardina, the site reaches depths between 20 and 40 metres, with an average depth of 25 metres. Divers must be prepared for strong currents, which dictate dive planning and route navigation. Visibility typically ranges from 5 to 10 metres. Due to the significant depth, potential for strong currents, and overhead boat traffic, this site is suited for intermediate divers. A surface marker buoy is essential for all ascents to manage risks from passing vessels. Water temperatures remain cool, ranging from 14 to 17 degrees Celsius throughout the year.

Barcoquemao is a 12-metre pleasure boat wreck resting on a sand bed at a maximum depth of 37 metres. The vessel sank following a fire and is now an isolated structure suitable for advanced divers. Conditions at the site are variable, with visibility ranging from 10 to 30 metres and water temperatures between 14C and 18C. Due to the depth, divers must manage decompression and nitrogen narcosis risks. Access is by boat only, with typical dives lasting around 30 minutes. Species recorded around this area include wrasses, bream, scorpionfish, great barracuda, and various crustaceans such as hermit crabs and abalone.

El Calon is a shallow shore dive located 50 metres from the coast near Cartagena, Spain. The site features a combination of reef sections and a cave, with depths ranging between 2 and 4 metres. It is suitable for beginner divers, though the shore entry requires caution due to surf and shore break conditions. Divers should remain alert to variable currents throughout the area. Water temperatures fluctuate between 15C in winter and 27C in summer. Facilities including showers and a cafe are available on site to assist with post-dive comfort. Species recorded around this area include wrasses, bream, scorpionfish, and various crustaceans.

Loza del Payo is a varied marine site featuring a reef, wall, and pinnacle structure. Depths range from 6 to 33 metres, with an average of 20 metres, making it suitable for intermediate divers with advanced certification. Access is by boat only, and divers should be prepared for strong currents and visibility between 10 and 30 metres. Due to the depth and current, careful buoyancy control and monitoring for nitrogen narcosis are essential. Water temperatures remain between 14 and 18 degrees Celsius throughout the year, necessitating appropriate thermal protection such as a five-millimetre wetsuit or drysuit. Typical dive times are approximately 40 minutes.

Cala Cerrada is a horseshoe-shaped cove in Cartagena, Spain, defined by its yellow sandstone cliffs and natural caves. The site features a mix of rocky perimeters and sandy patches, offering depths ranging from 1 to 14 metres with an average of 7 metres. Conditions are generally suitable for beginners, with mild currents and visibility typically between 10 and 25 metres. Entry is via the shore, making it accessible for both divers and snorkellers. Water temperatures fluctuate seasonally between 15C and 25C. Facilities at the site include parking and toilets. Divers and snorkellers should be aware of potential jellyfish and sharp coral in the area.