The Secret Beach at Ross Monument Cove is a secluded rocky cove in Strangford Lough, offering a quiet shore-entry snorkeling experience. The site features rocky outcrops that provide habitat for various reef fish and invertebrates. Water temperatures range from 8C to 15C throughout the year, and conditions generally feature mild currents. This site is suitable for beginners, though snorkelers should remain aware of boat traffic in the area. Facilities including parking and toilets are available nearby. A typical session lasts approximately 45 minutes.

The Blockhouse is a boat-access site situated at the mouth of Strangford Lough. The topography consists of a submerged bedrock shelf combined with artificial reef structures, including the ruins of a 17th-century fort. Divers can expect depths ranging from 5 to 22 metres, with an average depth of 12 metres. Conditions are variable, featuring strong currents that necessitate careful planning around slack tide. Visibility typically ranges between 5 and 10 metres. Due to the strong currents and boat traffic in the area, this site is recommended for intermediate divers. Water temperatures are cool, ranging from 8 to 15C throughout the year, requiring appropriate thermal protection to mitigate the risk of hypothermia.

Rostrevor Slipway is an artificial reef site located in Strangford Lough, providing a shore entry point near the pier. The site is suitable for beginners, with depths ranging from 1 to 9 metres and an average depth of 5 metres. Snorkellers should be aware of mild currents, potential surf, and strong currents in the area. Water temperatures fluctuate between 8C and 15C throughout the year. Facilities available at the site include parking, toilets, and guided tours. Typical sessions last around 30 minutes. The site is frequently used by the local sea swimming community and offers a sheltered environment compared to the lough entrance.

The Slope at Rostrevor Front Shore is a shore-entry reef site located in Strangford Lough. The topography consists of a shingle and mud seabed, providing a varied environment for snorkelers. Depths range from 1m to 8m, with an average depth of 4m, making it suitable for beginners. Access is facilitated by a concrete jetty and slipway situated opposite the local garage. Conditions vary, with visibility typically between 3m and 10m and mild currents. Water temperatures fluctuate throughout the year, ranging from 8C in March to 15C during the summer months.

Greenore Shore on the East Coast of Ireland is a shore-entry reef site characterised by a silty, cobbled slope. The site is suitable for intermediate divers and snorkellers, though conditions vary. Water temperatures range from 8C in late winter to 16C in August. Divers should be aware of moderate currents, potential low visibility, and local boat traffic. Facilities located nearby include parking, a cafe, and a dive shop. The site offers a practical entry point for those exploring the local marine environment, though users must remain vigilant regarding the changing conditions and maritime activity in the area.

Greencastle Old Pier is a shore-entry dive site situated at the mouth of Carlingford Lough. The site features old pier structures that function as an artificial reef, offering a vertical reef-like topography. Divers can explore depths ranging from 5 to 25 metres, with an average depth of 10 metres. Conditions are variable, and the site is subject to moderate to strong currents. Due to its sheltered nature, it is suitable for beginners, though caution regarding current strength is advised. The site is also well-regarded for snorkelling.

Greencastle Shore is a sheltered site located south of the old Greencastle pier on the east coast of Ireland. The topography features a transition from sandy patches to rocky outcrops covered in kelp and seaweed. Suitable for beginners, the site reaches depths of up to 12 metres. Divers and snorkellers should be aware of moderate currents, which can occasionally become strong. The water temperature ranges from 8C to 16C throughout the year. Shore access is available, and the site is supported by local facilities including parking, air fills, and equipment rental. Typical dives last approximately 60 minutes.

Greer's Quay is an artificial reef site located in Strangford Lough, consisting of an isolated stone pier that serves as a shore entry point. The topography features a silty seabed supporting a diverse range of marine life typical of the region, including various invertebrates and fish species. Divers should be prepared for depths ranging from 2 to 9 metres, with an average depth of 4 metres. The site is suited for intermediate divers due to the presence of strong currents and potential surf conditions. A typical dive duration is approximately 50 minutes. Water temperatures fluctuate between 8C and 15C throughout the year.