The Narrows in Strangford Lough is a drift and reef site defined by strong tidal currents. It is suitable for advanced divers, with depths ranging from 10 to 70 metres and an average depth of 15 metres. Typical dives last approximately 20 minutes. Due to the challenging conditions, including strong currents, boat traffic, and potential for decompression, this site requires careful planning. Entry is possible from both shore and boat. Snorkelling is possible, though it is strictly limited to the short slack water window to ensure safety. Water temperatures fluctuate between 9C and 15C throughout the year, and visibility varies from 2 to 10 metres.

The Pins is the site of a 19th-century wooden schooner, the S.V. Nimble, located in Strangford Lough. The wreck rests on a sand and gravel slope at an average depth of 10 metres, with a maximum depth of 12 metres. Divers access the site from the shore near the roadside lay-by. Conditions include moderate currents and visibility ranging from 3 to 8 metres. The site is suitable for beginners, with typical dives lasting around 30 minutes. Due to the nature of the wreckage, divers should be aware of potential entanglement hazards. Snorkelling is also possible at this location.

Outer Lees in Strangford Lough is a wreck site featuring the stern section of the Empire Tana. Divers and snorkellers can explore the hull, which is covered in dense kelp forests, sponges, and sea squirts. The site is located 1000 metres from shore and requires boat access. Conditions are variable, with depths ranging from 12 to 18 metres and visibility between 5 and 15 metres. Due to strong currents, down currents, and potential entanglement hazards, this site is suited for intermediate divers. Boat traffic is a common hazard, and the wreck presents an overhead environment. Facilities including air fills, guided tours, and boat charters are available nearby in Portaferry.

Ballyhenry Bay in Strangford Lough is a sheltered site featuring a well-established Zostera marina seagrass bed. This habitat serves as a nursery for juvenile fish and provides an environment for observing smaller marine life. The site is suitable for beginners and offers shore access for snorkelling. Water temperatures in the bay range from 9C in the late winter and early spring to 15C during the late summer months. As a sheltered location, it provides a manageable environment for those looking to explore the local seagrass ecosystem.

Inner Lees in Strangford Lough features the remains of a WWII blockship. The bow section of the vessel is a distinct feature that breaks the surface at low tide, making it a shallow site suitable for snorkelers. Access is straightforward from the adjacent shingle beach. Water temperatures at this site vary throughout the year, ranging from 9C in the late winter and early spring to 15C in the late summer and early autumn. Due to its shallow nature and ease of entry, the site is well-suited for beginners looking to explore maritime history in a sheltered marine environment.

Ballyhenry Island in Strangford Lough is a small tidal island that provides a shallow snorkeling environment along its boulder-strewn shore. Accessible from the shore, the site is suitable for beginners looking to explore the coastal topography. Water temperatures at this location vary throughout the year, ranging from 9C in the late winter and early spring to 15C during the late summer months. The site is also noted for its rock pooling opportunities at low tide. Due to the tidal nature of the island, visitors should plan their entry and exit times carefully according to the local tide tables.

Chapel Island Tidal Pool is a deep natural formation situated between Chapel Island and the mainland in Strangford Lough. The site maintains significant depth even during low tide, creating a contained environment for snorkelling. Access is possible via boat or by walking across the seabed during low tide, though the site is best suited for intermediate snorkellers due to the tidal nature of the area. Water temperatures fluctuate between 9C and 15C throughout the year. As a tidal pool, conditions can vary, and visitors should plan their entry and exit according to local tide tables to ensure safe navigation of the surrounding area.

Kilclief Beach, specifically the Castle Rocks area, is a reef site located on the western edge of the Strangford Narrows. The topography consists of a mix of sandy bottom and rocky reef, with depths ranging from 1 to 12 metres. This site is suitable for intermediate snorkellers due to strong currents and surf conditions. Water temperatures fluctuate between 9C and 15C throughout the year, and visibility typically ranges from 2 to 5 metres. Species recorded around this area include curled octopus, gray seal, orange-clubbed nudibranch, squat lobster, common lobster, conger eel, wrasses, flatworm, sea slug, gurnard, giant jellyfish, brittle star, sea star, and various crabs. Access is via the shore, with parking available nearby.