Rosroe Pier in Ireland offers a shore-entry dive featuring a combination of reef and kelp forest habitats. The site maintains an average depth of 8 metres. Conditions are variable, with visibility ranging from 5 to 50 metres and mild currents present. Water temperatures fluctuate between 9C in the winter and 16C during the late summer months. Due to the nature of the location, divers should remain aware of potential boat traffic in the area. Parking facilities are available for visitors. This site is suitable for beginner divers.

Doonee Beacon is a marine reef site in Ireland suitable for beginner divers. The site features a consistent depth of approximately 10 metres. Access is exclusively by boat. Divers should be prepared for variable conditions, as the site is subject to moderate currents, surf, and potential low visibility. Hazards at this location include cold water temperatures, which range from 9C to 16C throughout the year, as well as risks of entanglement and the presence of sea urchins. Given the environmental factors, divers should maintain appropriate awareness of their surroundings and thermal protection requirements.

The Barge is a wreck dive site located in Ireland. The site is shallow, with an average depth of 6 metres. Divers should be aware that conditions at this location can vary, and strong currents are a known hazard. Due to the presence of these currents, the site is best suited for intermediate divers. Water temperatures at the site fluctuate throughout the year, ranging from 9C in the winter months to 16C during the late summer and early autumn. As a wreck site, it offers a specific underwater topography for those interested in maritime history.

Inish Barna is a boat-access site located at the mouth of Killary Harbour, Ireland. The topography consists of dramatic underwater walls, canyons, and reefs. Divers can expect depths ranging from 6 to 45 metres, with an average depth of 25 metres. Conditions vary, with visibility spanning 3 to 50 metres and moderate currents. The site is suitable for intermediate divers, and boat access is required. Hazards include potential entanglement, strong currents, and surf. Facilities available at the site include showers and changing rooms. Typical dive times are approximately 50 minutes, and the site is also suitable for snorkelling.

Glassilaun Beach, situated near the mouth of Killary Fjord, offers shore access to rocky outcrops and kelp forests. The site is suitable for beginners, with depths ranging from 1 to 18 metres and an average depth of 5 metres. Visibility varies between 3 and 15 metres, and currents are generally mild. Water temperatures are cold, ranging from 9C to 16C throughout the year. Species recorded around this area include common lobster, compass jellyfish, flatworms, catsharks, squat lobsters, cod, common sea stars, grey sea slugs, zoanthids, brittle stars, tube worms, crabs, and common moon jellyfish. Hazards include cold water and jellyfish. Facilities include parking, toilets, showers, rinse stations, guided tours, and equipment rental.

Carraig Cois Ceim is a reef dive located off the southwest coast of Mayo, Ireland. This site is suited for intermediate divers, with depths ranging from 18 to 30 metres. Access is strictly by boat due to a strong surf break at the shore. Divers can expect visibility between 10 and 30 metres, with the clearest conditions typically occurring during settled summer weather. Water temperatures fluctuate between 9 and 16 degrees Celsius throughout the year, necessitating appropriate thermal protection. Be aware of potential currents in the area and monitor local conditions closely before descending to the reef.

Old Head in Ireland is a sheltered site featuring a snorkel trail that begins west of the pier wall. This location is part of the Mayo Blueway and offers a mix of rocky reef and kelp forest habitats. Suitable for beginners, the site reaches depths of 1 to 5 metres and is accessible via a shore entry. Divers and snorkellers can expect mild currents and water temperatures ranging from 9C to 16C throughout the year. The area supports a variety of temperate marine life typical of the region, including reef fish and invertebrates. Facilities at the site include parking, toilets, showers, first aid, and a cafe.

Clare Island Main Harbour features rocky reefs and kelp forests accessible from both shore and boat. The site is suited for intermediate snorkelers who should be prepared for cold water temperatures ranging from 9C to 16C throughout the year. The topography includes rocky structures near the harbour and Granuaile's Castle. Snorkelers should remain vigilant regarding boat traffic and potential surf conditions. The habitat supports a variety of temperate marine life, including various reef fish and invertebrates typical of the region. Due to the variable conditions and cold water, appropriate thermal protection is recommended for all in-water activities.