Cala Leño is a quiet cove in Cartagena, Spain, featuring a pebble and sand entry. This reef site is suitable for beginners and offers both diving and snorkelling opportunities. The topography consists of rocky bay sides that extend to depths of 2 to 15 metres, with an average depth of 7 metres. Located 50 metres from the shore, the site experiences mild currents and visibility ranging from 5 to 15 metres. Water temperatures fluctuate between 15C and 25C throughout the year. Divers and snorkellers should be aware of sea urchins present in the area. Parking is available for visitors, and a typical dive lasts approximately 45 minutes.

Cabezo del Castellar is a rocky reef formation located in Cartagena, Spain, that separates Playa de Nares from Playa del Castellar. The underwater topography consists of large boulders interspersed with sandy patches, creating a varied environment for exploration. This site is suitable for beginners, with depths ranging from 1 to 15 metres and an average depth of 8 metres. Access is via a shore entry, and conditions typically feature mild currents and visibility between 3 and 10 metres. Facilities available at the site include parking, showers, and toilets. A typical dive lasts approximately 45 minutes.

Cabezo de la Reya is a shallow reef and artificial reef site located at the eastern end of Playa de Bahía in Cartagena, Spain. The site features a rocky headland with exploration opportunities around the base of the cliffs and the nearby yacht club breakwater. Depths range from 2 to 9 metres, with an average of 5 metres, making it suitable for beginners. Access is via the shore, and conditions include mild currents and visibility ranging from 3 to 10 metres. Facilities available at the site include parking, toilets, showers, changing rooms, a rinse station, and a cafe. Hazards to be aware of include boat traffic, jellyfish, sea urchins, and sharp coral.

Playa de Bahía is a shore-entry reef site in Cartagena, Spain, offering shallow depths between 2 and 7 metres. With an average depth of 4 metres and mild currents, it is well-suited for beginners and snorkellers. Visibility typically ranges from 10 to 20 metres. The seabed consists of reef structures and sandy patches. Divers and snorkellers should exercise caution regarding hazards, including sea urchins, sharp coral, and stonefish; protective footwear and reef gloves are recommended. Jellyfish may also be present. Species recorded around this area include common octopus, European common cuttlefish, Mediterranean moray, wrasses, bream, and various blennies.

La Isla De Paco in Cartagena, Spain, is a versatile dive site featuring a combination of wall, cave, and reef topography. Suitable for beginners, the site offers depths ranging from 2 to 16 metres, with an average depth of 10 metres. Access is exclusively by boat. Divers can expect mild currents and visibility between 5 and 15 metres. Water temperatures fluctuate seasonally, ranging from 15C in winter to 25C in August. The site is well-regarded for training and introductory dives due to its shallow profile. Divers should be aware of sharp coral present in the area.

Puerto de Mazarron offers a diverse underwater landscape featuring reefs, walls, caves, wrecks, and artificial reefs. Located 4000 metres offshore, this site requires boat access and provides depths ranging from 2 to 60 metres. While shallow areas accommodate beginners, deeper sections are suited for advanced divers. Conditions include mild currents and visibility between 5 and 15 metres. Water temperatures remain between 14 and 17 degrees Celsius, necessitating at least a 5mm wetsuit. Divers should exercise caution regarding overhead environments, potential entanglement, and variable visibility. Full facilities, including rinse stations and equipment rental, are available at the boat entry point.

Freo is a drift dive located on the crest of an underwater mountain near Cartagena, Spain. The site features a depth range extending from 26 metres at the summit down to 42 metres. Due to the strong currents and significant depth, this site is strictly for advanced divers. Access is exclusively by boat. Divers should be prepared for challenging conditions and manage their depth profiles carefully throughout the dive. The site offers various navigation routes depending on diver experience and certification levels.

Playa del Puerto in Cartagena provides a shore entry onto a mixed reef and seagrass environment. Suitable for beginners, the site features depths ranging from 2 to 15 metres with an average of 9 metres. Currents remain mild, though visibility varies between 5 and 25 metres. Divers should exercise caution during entry due to sharp rocks and sea urchins in the shallows; thick-soled footwear is recommended. Facilities include parking, showers, changing rooms, a rinse station, and air fills. Species recorded around this area include common octopus, European common cuttlefish, Mediterranean moray, wrasses, bream, and various blennies.