Três Irmãs is a shallow reef located 3500 metres off the Sesimbra Coast in Portugal. This site is suitable for beginners, featuring an average depth of 3 metres. Divers access the reef by boat, with typical dive durations lasting around 25 minutes. Visibility at the site varies between 5 and 18 metres, and water temperatures range from 15C to 19C throughout the year. Due to its location, boat traffic is a primary hazard to consider. Facilities available for visitors include parking and showers. Night diving is permitted at this location.

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.

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.

Bico Da Agulha is a reef site located along the Sesimbra Coast in Portugal. This dive site is accessed by boat and is suited for intermediate divers due to the presence of strong currents and surge. The site features a depth range of 8 to 9 metres. Visibility at this location varies between 3 and 15 metres, depending on local conditions. Water temperatures fluctuate throughout the year, ranging from 15C in the winter and spring months to 19C during the late summer. As a reef environment, the site offers a specific topography for exploration within these depth parameters.

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.

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.

Cabo Espichel, located on the Sesimbra Coast, offers shore-based reef diving in shallow, calm water. This site is suitable for beginners working on their skills close to the surface. Water temperatures range between 15C and 19C throughout the year, necessitating a wetsuit. Visibility at the site is variable and can shift between visits, so checking local conditions before arrival is recommended. As there are no guaranteed facilities on site, divers should arrive fully prepared with all necessary equipment. The reef environment provides a habitat for various invertebrates, including common octopus and European common cuttlefish, which are frequently observed by those diving at this location.

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.