Glenarm Marina offers a sheltered snorkelling experience suitable for beginners. Access is via the slipway located in front of the boathouse. The site features a mix of artificial and natural reef structures with depths ranging from 1 to 5 metres, averaging 3 metres. Snorkellers must remain close to the shoreline to avoid the active boating channel. Water temperatures fluctuate between 8C and 14C throughout the year. Species recorded around this area include wrasses, catsharks, brittle stars, rock crabs, sea stars, shrimp, tube worms, snails, European green crabs, rockpool prawns, shannies, and sea squirts. Facilities including parking, toilets, and showers are available on-site.

Carnlough Bay is a reef site located in Northern Ireland, offering shore access via a concrete slope equipped with a handrail. The topography consists primarily of a sandy beach, with rocky patches situated at the northern and southern ends of the bay. Conditions are generally mild, with water temperatures ranging between 8C and 14C throughout the year. The site is suitable for beginners and provides facilities including parking, a cafe, toilets, showers, and changing rooms. Due to the water temperature, which does not exceed 20C, the site is not considered suitable for comfortable swimming year-round.

Carnlough Harbour, known for the Braavos Steps, offers a sheltered shore entry into the harbour waters. The site features a mix of reef and artificial reef structures, with inner harbour walls covered in kelp forests. This shallow location is suitable for beginners, with an average depth of two metres. Snorkellers should remain aware of boat traffic within the harbour area. Facilities available at the site include parking, toilets, showers, changing rooms, and a cafe. A typical snorkel session lasts approximately 30 minutes, with water temperatures ranging from 8C to 14C throughout the year.

Ringfad, also known as Tommy's Port, is a rocky inlet within Strangford Lough that features a combination of reef topography and dense kelp forests. This shore-entry site is suited for intermediate divers, with typical dives lasting around 45 minutes. Conditions are characterised by mild currents and water temperatures ranging from 8C to 14C throughout the year. Divers should be aware of sharp coral present in the area. Parking is available for visitors, and the site is also suitable for snorkelling, holding a rating of 3 out of 5.

Ballygally Head is a shore-entry site located at the southern end of Ballygally Beach. The topography features rocky ledges, gullies, and crevices that create a varied underwater environment. Snorkellers can explore the kelp-rich reefs found along the coastline. Water temperatures at this site range from 8C to 14C throughout the year. Access is gained directly from the shore, making it a convenient location for those looking to explore the local marine environment. The site is well-regarded for its accessibility and interesting geological features.

Garron Point in Strangford Lough offers a shore-accessible dive and snorkel site defined by its dramatic limestone and basalt ledges. The underwater topography consists of rocky reefs and deep gullies, reaching depths of up to 10 metres. Conditions at this site are variable, with moderate currents and visibility typically ranging between 5 and 10 metres. Due to the presence of surf, cold water temperatures between 8C and 14C, and moderate currents, this site is best suited for intermediate divers. Parking is available near the entry point. The site provides a rugged coastal environment for both diving and snorkelling activities.

Drains Bay is a shingle beach located north of Larne in Strangford Lough. This site features rocky outcrops at both ends of the beach, providing a shallow environment suitable for beginner snorkellers. Access is via the shore, and the site offers facilities including parking and toilets. Conditions are generally mild, though water temperatures fluctuate between 8C and 14C throughout the year. As a shore-based location, it provides a relaxed setting for those looking to explore the coastal topography of the area.

Red Bay Shore in Strangford Lough offers a varied underwater landscape featuring a kelp-covered boulder wall that transitions into a sandy seabed. This site is suitable for beginners, with depths ranging from 3 to 10 metres and an average depth of 5 metres. Access is via old concrete steps located on the Garron Road, with parking available nearby. Divers should be aware of cold water temperatures, which fluctuate between 8C and 14C throughout the year, as well as potential rip currents and surf conditions. The site is also suitable for snorkelling, holding a rating of 3 out of 5.