Ardglass Gullies in Strangford Lough features a series of underwater gullies carved into folded sedimentary rock. The site includes a small sea cave, creating a complex topography for snorkellers. The walls of the gullies are covered in kelp, sponges, and anemones. Water temperatures at this site range from 9C to 15C throughout the year. Due to the presence of an overhead environment, surf, and cold water, this site is recommended for intermediate snorkellers. Entry is via the shore. Snorkellers should be prepared for variable conditions typical of this marine environment.

Phennick Point in Strangford Lough offers a sheltered environment for snorkelling, featuring rocky inlets, a sandy seabed, and scattered boulders. This site is well-suited for beginners due to the protection from wind and mild tidal currents. Snorkellers can expect depths ranging from 1 to 3 metres, with an average of 2 metres. Visibility varies between 2 and 8 metres. Access is via the shore, and the site is equipped with nearby facilities including parking, toilets, showers, and equipment rental. Be aware of boat traffic in the area and the risk of hypothermia due to water temperatures ranging from 9 to 15 degrees Celsius.

Sheepland is a rocky reef site located in Strangford Lough near Ardglass. This shore-entry dive offers depths ranging from 1 to 20 metres, with an average depth of 5 metres. Divers can expect mild currents and visibility between 5 and 15 metres. The water temperature remains cold throughout the year, typically between 9C and 15C, necessitating the use of a thick 5/4mm wetsuit with boots and a hood. The site is suitable for intermediate divers and provides a 4/5 rating for snorkelling. Hazards include jellyfish, sea urchins, and sharp coral. Parking is available at the site.

Gun's Island in Strangford Lough features a topography of sheer underwater walls and rocky gullies. Located 183 metres offshore, the site requires boat access and is suited for advanced divers due to moderate to strong currents. Depths reach up to 16 metres over a rocky seabed. Water temperatures range from 9C to 15C throughout the year. Species recorded around this area include Gray Seal, Curled Octopus, Common Lobster, Conger Eel, Catshark, and various nudibranchs and sea stars. The site is also suitable for snorkelling.

The Water Rock in Strangford Lough is a shallow reef and artificial reef site suitable for beginners. Access is via a shore entry at the slipway of the historic stone pier. The site is shallow, with depths ranging from 0 to 5 metres and an average of 2 metres. It is best explored at high tide, as the harbour dries out significantly at low water. Conditions include mild currents and visibility between 3 and 10 metres. Species recorded around this area include gray seals, curled octopus, wrasses, catsharks, squat lobsters, common lobsters, sea slugs, gurnards, orange-clubbed nudibranchs, giant jellyfish, flatworms, conger eels, crabs, and sea stars. Hazards include entanglement and low visibility.

Water Rock is a prominent rocky outcrop located at the entrance to Killough Bay in Strangford Lough. This site features underwater reefs characterised by mixed algae and dense kelp forests. Divers and snorkellers can explore depths ranging from 2 to 18 metres. Access is by boat, as the site is situated 400 metres from the shore. Conditions include moderate currents and water temperatures between 9C and 15C. Species recorded around this area include grey seals, curled octopus, wrasses, conger eels, catsharks, and various crustaceans such as common lobsters and squat lobsters. Due to boat traffic, divers should exercise caution during their 45-minute dives.

Killough Harbour near Coney Island is a sheltered marine site located within Strangford Lough. The topography features a combination of sandy areas and rocky ledges surrounding the island, providing a protected environment for snorkellers. Water temperatures in this region fluctuate between 9C and 15C throughout the year. Access to the water is via the shore, making this a suitable location for beginners. The site is rated 3/5 for snorkelling, offering a calm setting for exploring the local underwater terrain.

Benderg Bay is a reef site located within the Killard National Nature Reserve in Strangford Lough. This shore-entry location is suitable for beginners, offering shallow depths ranging from 1 to 8 metres with an average of 4 metres. The environment features extensive rock pools and sheltered waters. Conditions vary, with mild currents and potential hazards including cold water, surf, and rip currents. Species recorded around this area include curled octopus, squat lobster, common lobster, wrasses, flatworms, sea slugs, catsharks, gurnards, conger eels, giant jellyfish, orange-clubbed nudibranchs, crabs, and sea stars. Parking is available at the site, which is well-suited for a 45-minute snorkel session.