Loughan Bay, located south of Torr Head in Strangford Lough, offers a remote snorkelling experience for advanced practitioners. Access requires a steep scramble down to the foreshore, where the topography consists of wave-washed metamorphic rock platforms and deep rock pools. Water temperatures at this site range from 8C in March to 14C between August and October. Due to the exposed nature of the coastline and the challenging entry, this site is rated 2/5 for snorkelling. It is best suited for those comfortable with rugged, wild coastal environments and variable sea conditions.

Portaleen Harbour at Torr Head is a rugged coastal site featuring deep canyons and underwater drop-offs. The topography is defined by extensive kelp forests and rocky reef structures. Entry is via a small slipway at the harbour. This site is suited for advanced snorkelers due to the presence of strong currents in the area. Water temperatures fluctuate between 8C and 14C throughout the year. As a wild coastal environment, it offers a challenging experience for those comfortable with variable marine conditions.

Cushendun Caves offers a unique coastal snorkeling experience at the base of its distinctive geological formations. Access is via a shingle beach, leading directly into shallow rocky reefs. The site is suitable for beginners and provides a moderate snorkeling experience. Water temperatures at this location vary throughout the year, ranging from 8C in March to 14C during the late summer months. As a shore-entry site, it allows for flexible exploration of the intertidal zone and surrounding rocky structures. Divers and snorkellers should be prepared for cool water conditions typical of the region.

Murlough Bay, located south of Fair Head, provides a shore entry point from a small beach situated behind a shore-side cottage. The site features interesting rock formations and is suited for intermediate snorkellers. Water temperatures at this location range from 8C to 14C throughout the year. Species recorded around this area include harbour seals, grey seals, wrasses, European spiny lobsters, sea stars, brittle stars, various crab species, snails, shannies, rockpool prawns, sea squirts, and hard coral. Access to the water is via a steep, winding road leading to the shoreline.

Drumnakill Point is a rocky headland located at the southern end of the bay near the ruins of an ancient church. This reef site features boulder slopes that provide a habitat for various invertebrates. Snorkelling here is suitable for intermediate participants due to the strong currents present in the area. Depths range from 1 to 10 metres, with an average of 5 metres. Access is via the shore, and parking is available nearby. Visibility typically fluctuates between 3 and 10 metres. Species recorded around this area include seals, wrasses, European spiny lobsters, rock crabs, sea stars, brittle stars, snails, European green crabs, rockpool prawns, shannies, hard corals, and sea squirts.

Fair Head Base, located in the Coal Mine Area of Strangford Lough, is a dramatic site situated beneath 600ft cliffs. The underwater topography is defined by massive fallen boulders and deep kelp forests, creating a rugged environment. Due to the challenging nature of the terrain and the exposed location, this site is suited for advanced snorkellers. Access is possible via both shore and boat entries. Water temperatures in this marine environment vary throughout the year, ranging from 8C in March to 14C during the late summer and autumn months.

Fair Head Base is a boat-access site situated at the foot of massive dolerite cliffs. The underwater topography is defined by large boulders and steep drop-offs. These structures are covered in a dense faunal turf consisting of sponges and bryozoans. Due to the nature of the terrain and the exposed location, this site is suitable for advanced snorkellers. Water temperatures at this location vary between 8C and 14C throughout the year. Access is strictly by boat, and the site offers a challenging environment for those exploring the base of these significant geological formations.

Fair Head is a dramatic snorkel site situated at the base of Northern Ireland's tallest cliffs. The underwater topography features massive submerged boulders and dense kelp forests, mirroring the vertical columns found above the surface. Divers and snorkellers navigate through deep gullies and canyons created by the rock formations. Due to the challenging nature of the environment and the variable conditions, this site is suitable for advanced snorkellers. Access is exclusively by boat. Water temperatures fluctuate between 8C and 14C throughout the year, requiring appropriate thermal protection for extended time in the water.