Ballywalter Harbour Bay is a sheltered site located immediately south of the working harbour jetty in Strangford Lough. The topography consists of a mix of reef, artificial reef, and wall structures. This shore-entry site is suitable for beginners, with depths ranging from 1 to 5 metres and an average depth of 3 metres. Divers and snorkellers can expect mild currents and visibility between 3 and 8 metres. Water temperatures fluctuate between 8C and 15C throughout the year. Facilities available at the site include parking, toilets, and a cafe. Hazards to be aware of include surf and currents.

Lime Kilns is a shore-entry dive site located in Strangford Lough, situated directly below the historic 19th-century lime kilns at the northern end of Long Sands. The underwater topography consists of a rocky substrate interspersed with kelp forest patches, providing structural diversity compared to the surrounding sandy areas. Divers can expect depths ranging from 1 to 10 metres, with an average depth of 5 metres. Conditions are variable, with visibility typically between 3 and 10 metres and mild currents. The site is suitable for intermediate divers and offers a moderate experience for snorkellers.

Long Sands Rock Pools in Strangford Lough feature significant rocky outcrops along the southern stretch of the beach. These formations create deep pools accessible at mid-to-low tide, providing a sheltered environment suitable for beginner snorkelers. The site functions as a natural aquarium for observing intertidal life in shallow water. Water temperatures at this marine site fluctuate between 8C and 15C throughout the year. Species recorded around this area include harbour seals, grey seals, curled octopus, catsharks, squat lobsters, common lobsters, gurnards, sea slugs, wrasses, compass jellyfish, grey triggerfish, orange-clubbed nudibranchs, skates, and giant jellyfish.

Skullmartin Rocks is an offshore reef located 1609 metres from the shore in Strangford Lough. The site is identified by an 11-metre beacon known as the Perch. Topography consists of dramatic bedrock outcrops interspersed with shell gravel beds. Due to the location, this site requires boat access and is suitable for advanced divers only. Conditions are characterised by strong currents, which are a primary hazard for those visiting the area. Water temperatures fluctuate between 8C and 15C throughout the year. While the site is primarily a dive location, it holds a snorkel rating of 4 out of 5.

Inner Lees is a shallow marine dive site located within Strangford Lough in the United Kingdom. The site features a consistent depth range of approximately 5 to 6 metres. Conditions at this location vary, with water temperatures ranging from 9C in the late winter and early spring to 15C during the late summer months. Given the shallow nature of the site, it is suitable for divers seeking a relaxed, low-depth experience. Access to the site is typically via boat, though local conditions should be assessed prior to entry.

Ballyvester Beach in Strangford Lough offers a shore-accessible snorkeling experience suitable for beginners. The site features a sandy bay that transitions into rocky, kelp-covered reefs. Water temperatures at this location range from 8C to 15C throughout the year. Divers and snorkellers should be aware of potential surf and sharp coral in the area. Mild currents are typically present. Facilities at the site include a car park and showers for visitor use.

Robbie's Point is a rocky reef located at the southern end of the coastal park in Donaghadee, Strangford Lough. This shore-entry site features a series of gullies and rock pools suitable for shallow-water exploration. Divers and snorkellers can expect depths ranging from 1 to 10 metres, with an average depth of 5 metres. Conditions at this site are variable, with visibility typically between 3 and 10 metres and moderate currents. Due to the presence of surf and currents, this site is best suited for intermediate-level divers. A typical dive duration is approximately 30 minutes. Water temperatures fluctuate throughout the year, ranging from 8C in March to 15C in August and September.

Kelly's Steps in Strangford Lough is an artificial reef site situated within a designated recreational harbour area. The site features stone steps and pier walls constructed of limestone, which provide a substrate for marine growth. Divers and snorkellers typically explore the area around these structures at depths ranging from 1 to 4 metres, with an average depth of 2 metres. Conditions include moderate currents and visibility between 2 and 5 metres. Due to cold water temperatures between 8 and 15C, dry suits or 8mm semi-dry suits are recommended. Hazards include boat traffic, entanglement risks, surge, and strong currents. Facilities available nearby include parking, toilets, showers, and a cafe.