Marble Hill in Mulroy Bay, Ireland, features a reef environment characterised by rock outcrops at the eastern end of the beach. This site is suitable for beginners, offering a shallow average depth of 3 metres with a range of 1 to 5 metres. Snorkellers can expect mild currents and visibility ranging from 3 to 15 metres. Access is via the shore, with facilities including parking, toilets, and showers available. Water temperatures fluctuate between 9C and 15C throughout the year, necessitating appropriate thermal protection. Hazards at this location include sea urchins and sharp coral. Typical sessions last approximately 45 minutes.

Horn Head in Mulroy Bay offers a diverse underwater landscape featuring reefs, kelp forests, and cave systems. Divers can explore depths ranging from 5 to 30 metres, with an average depth of 15 metres. The site is subject to moderate currents, surge, and surf, requiring boat access and careful planning around slack water. Visibility is highly variable, fluctuating between 5 and 30 metres. Due to water temperatures between 9 and 15 degrees Celsius and potential surge, a drysuit is recommended. Divers should maintain close contact with their guide and carry a surface marker buoy to manage the changing conditions.

Melmore Head in Mulroy Bay offers a challenging marine environment defined by dramatic rock walls, underwater gullies, and steep drop-offs. Divers can expect depths ranging from 10 to 30 metres, with an average of 20 metres. The site is subject to strong currents and surge, making it suitable for advanced divers only. Entry is possible via both shore and boat. Visibility typically ranges between 10 and 20 metres. The habitat supports a variety of temperate marine life, including various reef fish and invertebrates common to the region. Facilities at the site include parking, and a typical dive duration is approximately 40 minutes.

Port Na Ling in Mulroy Bay offers a rugged, natural setting for snorkelling, characterised by extensive rock pools and gullies. This shore-entry site is suitable for beginners, with depths ranging from 1 to 5 metres and an average depth of 2 metres. Conditions vary, with visibility typically between 5 and 15 metres and mild currents. Water temperatures are cold, ranging from 9C to 15C throughout the year, necessitating a wetsuit for comfort. Hazards include potential entanglement, variable visibility, and surf. Parking is available for visitors. The site provides a quiet environment for exploring the local topography.

Kincasslagh Bay in Donegal, Ireland, offers a sheltered environment for snorkelling, particularly suited to beginners. Located on the inner side of Cruit Island, the site features shallow, calm waters. The seabed consists of a sandy bottom interspersed with rocky patches and areas of seagrass. Water temperatures at this site vary throughout the year, ranging from 9C in the winter months to 16C in August. Access to the water is via the shore. With a snorkel rating of 3/5, it provides a accessible experience for those looking to explore the coastal shallows of the region.

Leabgarrow Bay on Arranmore Island is a sheltered site forming part of Ireland's first Island Blueway. The topography consists of reefs and kelp forests accessible from the pier. Conditions are generally suitable for beginners, with mild currents and water temperatures ranging from 9C in winter to 16C in August. The site offers both shore and boat entry options. Facilities at the location include parking, toilets, showers, changing rooms, a rinse station, and a cafe. Divers and snorkellers can also access air fills, equipment rental, gear storage, boat charters, and guided tours through the local dive shop.