Elly Bay is a sheltered site on the Mullet Peninsula in Ireland, offering a mix of reef, seagrass, and artificial reef habitats. This shore-entry location is suitable for beginners, with depths ranging from 1 to 5 metres and an average depth of 3 metres. The eastern side of the bay is particularly calm, providing mild current conditions for both divers and snorkellers. Water temperatures fluctuate between 9C and 16C throughout the year. The site features sandy bottoms and seagrass patches, which support a variety of temperate marine life and invertebrates typical of the region. Facilities at the site include parking, toilets, showers, and first aid.

Belmullet Tidal Pool is a 20-metre man-made structure in Ireland that fills with Atlantic water at high tide. This site provides a controlled environment for beginners to explore, offering a depth of 1 to 2 metres. The pool features wall topography and acts as an artificial reef, supporting a variety of temperate marine life and invertebrates typical of the region. Divers and snorkellers should be prepared for cold water, which ranges from 9C to 16C throughout the year. Entry is via the shore, and while the pool offers protection from open-sea currents, users should remain aware of potential surge and surf conditions.

Silver Strand at Dugort is a reef site located on the north side of Achill Island, facing Blacksod Bay. This shore-entry location is suitable for beginners, though the water is cool, ranging from 9C to 16C throughout the year. Snorkellers should exercise caution due to potential rip currents, strong currents, and surf conditions. The site is part of a coastal trail that extends toward Golden Strand, passing near seal caves and bird colonies. Typical sessions last around 60 minutes. Due to the cool water temperatures, appropriate thermal protection is necessary to prevent heat loss during extended exposure.

Portacloy Beach is a horseshoe-shaped bay in Sligo, Ireland, sheltered by dramatic cliffs that provide protection from heavy Atlantic swells. This site features a combination of reef and kelp forest habitats. Diving and snorkelling take place at depths ranging from 1m to 5m, with an average depth of 2m. Access is via the shore. Conditions are variable, with visibility typically between 5m and 15m. Divers should be aware of potential hazards including surf, rip currents, and strong currents. The site is suitable for intermediate divers and offers facilities including parking, toilets, and showers. Water temperatures fluctuate between 9C and 15C throughout the year.

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.

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.

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.