Playa de la Carolina is a protected site within the Cuatro Calas landscape near Cartagena, Spain. This east-facing beach features a rocky right-hand flank and a small underwater arch, providing varied topography for snorkelers. Depths range from 1 to 10 metres, with an average of 5 metres, making it suitable for beginners. Entry is directly from the shore. Conditions vary, with visibility between 5 and 15 metres and mild currents. Water temperatures fluctuate significantly throughout the year, ranging from 15C to 27C. Species recorded around this area include wrasses, Mediterranean moray, common octopus, and various blennies. Facilities include parking, toilets, showers, and a rinse station.

Calarreona is a coastal site located in Cartagena, Spain, featuring a diverse topography of reefs, seagrass meadows, walls, and pinnacles. Reaching depths of up to 12 metres, the site is suitable for beginners and offers calm conditions with only mild currents. Access to the site is exclusively by boat. The underwater environment consists of rocky labyrinths and Posidonia oceanica seagrass beds. Due to the presence of boat traffic, divers and snorkellers should remain vigilant during their activities. Facilities at the location include toilets.

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.

La Losa is a deep-water reef and cavern system located 1500 metres off the coast of Cartagena, Spain. The site features a gradual slope that descends from 25 to 42 metres, with an average depth of 35 metres. Due to the significant depth, this site is reserved for advanced divers, and careful monitoring of depth and nitrogen narcosis risk is essential. The site is accessed exclusively by boat and offers a mild drift dive experience. Visibility typically ranges between 10 and 20 metres, and water temperatures remain between 14 and 17 degrees Celsius throughout the year, necessitating appropriate thermal protection.

Cala de la Herradura is a small horseshoe-shaped cove situated at the southwestern end of Playa Matalentisco near Aguilas. This shore-entry site features a rocky seabed and is suitable for beginners, with depths ranging from 1 to 10 metres and an average depth of 5 metres. Visibility typically fluctuates between 5 and 15 metres. While the site is generally calm, snorkellers should be aware of the potential for strong currents and sharp rocky formations. The location offers a quiet environment for exploring the coastal topography.

El Tubo is an artificial reef and wreck site located in Cartagena, Spain. This site features a small underwater structure that reaches a maximum depth of 16 metres. It is suitable for beginner divers and is accessed exclusively by boat. Divers should be aware of boat traffic in the area. Conditions are generally mild, with water temperatures ranging from 15C in the winter months to 25C in August. The site offers a varied underwater topography suitable for those interested in exploring artificial structures and wreck remnants.

El Castillo in Cartagena, Spain, features a combination of natural reef and artificial structures. This site is suitable for beginners, with depths ranging from 3 to 24 metres and an average depth of 15 metres. Divers access the site by boat. Conditions are generally calm with mild currents, though surge can be a factor. The site is well-suited for night diving. Facilities available at the location include parking, toilets, showers, changing rooms, a rinse station, air fills, equipment rental, and boat charter services. Guided tours are also provided for those exploring the area.

Embarcadero del Hornillo in Cartagena, Spain, offers a unique snorkelling experience around the base of a historic 1903 mineral loading dock. The site consists of iron and concrete structures that now function as an artificial reef within a sheltered bay. Entry is via the shore, making it suitable for beginners. Water temperatures fluctuate throughout the year, ranging from 15C in winter to 27C in August. Species recorded around this area include Mediterranean Moray, Common Octopus, European Common Cuttlefish, Great Barracuda, wrasses, scorpionfish, rock cod, Cratena slug, kingfish, Fried Egg Jellyfish, stargazer, Turkish wrasse, groupers, and conger eel.