Bloody Bridge Rock Pools, located where the mountains meet the sea in Strangford Lough, offer a unique snorkelling environment within granite basins. The site features deep river pools and rock slides as the river flows toward the Irish Sea. Snorkellers should be aware that conditions vary, and the site is best suited for those with intermediate experience. Access is via the shore. Water temperatures fluctuate throughout the year, ranging from 8C in March to 15C during the summer months. The topography is defined by the dramatic granite formations and the rushing river water.

Maggie's Leap is a dramatic chasm located in the cliffs south of Newcastle within Strangford Lough. This site features vertical underwater walls adorned with sponges and anemones. Access is primarily by boat or kayak, and the location is suited for advanced snorkellers due to the nature of the terrain. Water temperatures in the area fluctuate between 8C and 15C throughout the year. The site is noted for offering some of the best visibility in the region, providing a clear view of the cliff topography and the sessile marine invertebrates that colonise the rock faces.

Newcastle Harbour Slipway provides a shore entry point at the southern end of the Newcastle promenade. This site features a kelp forest habitat and is suitable for beginners, with depths typically ranging between 1 and 3 metres. The environment is sheltered, making it a practical location for snorkelling. Divers and snorkellers should remain aware of boat traffic in the vicinity of the harbour walls. Facilities including parking, toilets, and showers are available for visitors. The water temperature varies throughout the year, ranging from 8C in March to 15C during the summer months. A typical session at this site lasts approximately 45 minutes, with mild currents present.

Annalong Rock Pools, located in the Mourne Mountains, offer a freshwater snorkeling experience within a series of natural pools. The largest pool provides sufficient depth for full submersion, set against a backdrop of granite boulders. The water is peaty in appearance. Access is via the shore, and the site is suitable for beginners. Water temperatures fluctuate throughout the year, ranging from 8C in March to 15C during the summer months of July, August, and September. As a shore-based activity, it is rated 3 out of 5 for snorkeling.

Keel Point is situated at the mouth of the Dundrum Inner Bay channel within Strangford Lough. This shore-entry site is rated for intermediate snorkelers due to the tidal nature of the channel. Water temperatures fluctuate between 8C and 15C throughout the year, requiring appropriate thermal protection. The area is a known haul-out site for a large colony of seals, which are frequently observed swimming in the channel during high tide. Snorkelers should be mindful of the currents associated with the bay entrance when planning their visit.

Arthur's Port is a historic rocky cove located north of Annalong Harbour. This site features a combination of reef structures and kelp forests, characterised by kelp-covered gullies. Access is via the shore, and the site is suited to intermediate snorkellers. Conditions include moderate currents and potential surf, requiring careful planning. Water temperatures are cool, ranging from 8°C to 15°C throughout the year, and are not considered comfortable for prolonged swimming. Parking is available for visitors. Due to the nature of the environment and the presence of strong currents and surf, this location is best suited for those accustomed to cold-water conditions.

Annalong Harbour Slipway provides a sheltered shore entry point located just north of the main harbour entrance. This site is suitable for beginners, offering a shallow dive experience with depths ranging from 1 to 2 metres and an average depth of 1 metre. Divers typically spend 45 minutes exploring the area, which features both artificial and natural reef structures. Conditions are generally mild, though divers should remain aware of potential surge, entanglement risks, and local boat traffic. Facilities available at the site include parking, toilets, showers, and a cafe. The location is also suitable for snorkelling, with a rating of 3 out of 5.

Springwell Port is a sheltered bay located along the Annalong Coastal Path in Strangford Lough. The site features a mix of sand and rock substrate, supporting shallow kelp forests. Divers and snorkellers can expect depths ranging from 1 to 10 metres, with an average depth of 5 metres. Access is via the shore, and the site is suitable for beginners due to the mild currents. Visibility typically varies between 3 and 8 metres. Water temperatures fluctuate between 8C and 15C throughout the year. Divers should remain aware of boat traffic in the area. Parking facilities are available for visitors.