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.

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.

St. Patrick's Well at Ardtole offers a rugged shore entry into the marine environment of Strangford Lough. The site is characterised by a rocky seabed featuring extensive kelp forests and deep rock pools that are accessible at low tide. Divers should be prepared for cool water temperatures ranging from 9C to 15C throughout the year, necessitating appropriate thermal protection for extended exposure. This site is suited for intermediate divers due to the presence of strong currents and surf conditions. Snorkelling is also possible at this location, though conditions vary based on the local sea state.

Granagh Bay is a nature reserve situated at the entrance of the Narrows in Strangford Lough. This shore-entry site is influenced by powerful tidal currents, making it suitable for intermediate snorkelers. The area is known for its seal colony, providing opportunities to observe these marine mammals. While specific sightings at this exact location are not confirmed, species recorded around this area include curled octopus, orange-clubbed nudibranch, squat lobster, common lobster, sea slug, wrasses, gurnard, conger eel, flatworm, catshark, giant jellyfish, brittle star, sea star, and various crabs. Water temperatures at the site range from 9C to 15C throughout the year.

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.

Kearney Village Shoreline in Strangford Lough offers a sheltered reef environment ideal for beginner snorkellers. The site features slate rock formations that create natural channels and rock pools, providing a habitat for various intertidal species. Snorkelling here is accessed directly from the shore, with depths ranging from 1 to 5 metres and an average of 3 metres. Conditions include mild currents and visibility between 2 and 8 metres. Water temperatures remain cool, ranging from 9C to 15C, requiring appropriate thermal protection to mitigate the risk of hypothermia. Hazards include sea urchins, sharp coral, and surf. Parking and toilets are available at this National Trust-managed location.

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.