Jardim das Gorgonias is a reef and drift dive site located along the Sesimbra Coast. Accessible only by boat, the site features depths ranging from 4 to 20 metres, with an average depth of 14 metres. Divers should expect mild currents and visibility between 3 and 15 metres. Water temperatures remain between 15C and 18C throughout the year. The site is suitable for beginners, with typical dives lasting around 50 minutes. Hazards to consider include boat traffic, potential for low visibility, and strong currents. Facilities available nearby include a dive shop and a cafe.

Baía da Armação is a sheltered dive site on the Sesimbra Coast, protected from prevailing northern winds. This shallow location is suitable for beginners, with depths ranging from 4 to 14 metres. Navigation is straightforward, featuring a mix of sandy areas and rocky structures. Two large stone discs are located at the base of the anchor line. Divers regularly encounter wrasses, Tricolor Doris, and Felimare villafranca. Other species recorded here include European Common Cuttlefish, Common Octopus, Mediterranean Moray, scorpionfish, and various nudibranchs. Due to the nature of the site, boat access is required and divers should remain aware of local boat traffic.

Pedra do Leão is a distinctive reef site on the Sesimbra Coast featuring a large rock formation with an archway at a depth of 6 metres. Divers can swim through this arch, which is surrounded by a 20 to 30-metre wide path of brown algae. The site reaches a maximum depth of 14 metres, where the topography transitions to a sandy bottom. With an average depth of 8 metres and mild currents, this location is suitable for beginners. Access is by boat only, and divers should remain aware of boat traffic in the area. Visibility typically ranges between 5 and 10 metres, with water temperatures fluctuating between 15C and 18C throughout the year.

Barco das Telhas is a technical dive site located off the Sesimbra Coast, featuring a combination of wreck, reef, and drop-off topography. Situated at depths between 55 and 65 metres, this site is reserved for expert divers capable of managing decompression and overhead environments. Conditions are challenging, with strong currents and visibility fluctuating between 3 and 15 metres. Water temperatures remain cool, ranging from 14 to 16 degrees Celsius, necessitating appropriate thermal protection. Access is strictly by boat, and divers must remain vigilant regarding entanglement risks within the wreck structure and boat traffic during surfacing. Careful planning is required to navigate the surge and current conditions.

Penedos is a wall and reef site located 500 metres off the Sesimbra Coast. This site is suited for advanced and technical divers, with depths ranging from 20 to 90 metres and an average depth of 65 metres. Divers must manage moderate currents and occasional surge, which can impact buoyancy control. Visibility typically ranges between 10 and 30 metres. Water temperatures remain cold, between 14 and 16 degrees Celsius, necessitating a drysuit or 7mm wetsuit. Boat access is required for all dives. Species recorded around this area include Mediterranean moray, European common cuttlefish, common octopus, squat lobster, cuckoo wrasse, conger eel, various flatworms, and nudibranchs.

Cabo d Aires is a reef site located off the Sesimbra Coast, offering a dive experience suitable for beginners. The reef structure sits at depths between 15 and 25 metres, with visibility ranging from 10 to 30 metres. The site is characterised by a lack of current, allowing for a relaxed exploration of the reef topography. Access to this location is by boat only, requiring advance arrangements with a local charter operator. Given the water temperatures of 15 to 18 degrees Celsius, a 5mm wetsuit with a hood is recommended for comfort throughout the year.

Pedra do Meio is a reef site located 500 metres off the Sesimbra Coast. The site features a reef structure ranging between 8 and 13 metres in depth, with an average depth of 10 metres. It is suitable for beginner divers, offering mild currents and visibility between 5 and 10 metres. Access is by boat only, and the site supports night diving. Divers should remain aware of boat traffic in the area and follow specific ascent procedures provided by their skipper. Water temperatures range from 15C to 18C throughout the year. As there are no facilities at the site, divers should confirm arrangements with a local operator before travelling.

The Sesimbra Coast offers a diverse underwater environment featuring reefs, wrecks, caves, kelp forests, and artificial reefs. Divers can explore depths ranging from 10 to 30 metres, with visibility typically between 5 and 20 metres. The site is suitable for beginners, with both shore and boat entries available. Marine life frequently observed includes common octopus, scorpionfish, European common cuttlefish, and various wrasses. Other species such as tricolor doris, slipper lobster, conger eel, and lefteye flounder are also recorded. Water temperatures remain between 15 and 17 degrees Celsius, necessitating appropriate thermal protection. Facilities include parking, showers, changing rooms, and rinse stations. Night diving is permitted, offering a different perspective of the reef.