Deadman's Point in Rosses Point is a shore-entry site featuring a reef and cave system. Located where the estuary meets the open bay near the Sligo Yacht Club, the site offers depths ranging from 1 to 5 metres with an average of 3 metres. Divers should be prepared for cold Atlantic water temperatures between 9C and 16C. Conditions vary, with visibility typically between 3 and 10 metres. Hazards include boat traffic, surf, rip currents, and strong currents. The site is suited for intermediate divers, and facilities including parking, toilets, and showers are available. Guided tours are also offered for those exploring this rocky shoreline.

Aughris Pier at Rosses Point offers a shore entry via a slipway or steps into a rocky bay. This site features a mix of natural reef and artificial reef structures, suitable for beginners. Divers and snorkellers can explore the area to the right of the pier, where the shoreline rocks contain embedded Carboniferous fossils. Conditions are generally mild, with depths ranging from 1 to 7 metres and an average depth of 6 metres. Water temperatures fluctuate between 9C and 16C throughout the year. Divers should be aware of potential entanglement hazards. Facilities at the site include parking, a cafe, and access to boat charters.

Streedagh Point in Mullaghmore offers a unique snorkelling experience across limestone ledges and fossil beds dating back 350 million years. This site features a mix of reef and wreck topography with depths ranging from 3 to 20 metres, averaging 5 metres. Access is via the shore at the northern end of Streedagh Strand. Conditions are variable, with visibility between 2 and 10 metres and water temperatures fluctuating from 9C to 16C throughout the year. Due to strong currents, rip currents, and surf, this site is suited for intermediate snorkellers. Facilities including parking and toilets are available nearby.

Clashymore is a remote snorkelling site located within a natural rocky gut on the southern side of the uninhabited Inishmurray Island. Accessible only by boat, this site is suited for advanced snorkellers due to its exposed location. The environment consists of a rocky topography typical of the Atlantic coastline. Water temperatures at the site fluctuate throughout the year, ranging from 9C in the winter months to 16C in August. As an exposed marine location, conditions can vary significantly, requiring careful planning and experience to navigate the coastal environment safely.

Mullaghmore Lobster Farm Steps is a shallow reef and kelp forest site accessed via steps cut into the rock behind the Pier Head Hotel. The site is best explored at high tide when the water covers the inner rocky gullies. Divers and snorkellers can expect depths ranging from 2 to 5 metres, with an average depth of 3 metres. Conditions are generally suitable for beginners, though visitors should be aware of potential surf and currents. Visibility typically ranges between 8 and 15 metres. Facilities available at the site include parking, toilets, showers, and changing rooms.

Bishop's Pool is a natural tidal pool carved into the limestone shelf of Mullaghmore Head. This sheltered, enclosed environment provides a site for diving and snorkelling even when Atlantic swells are active nearby. The site is suitable for beginners, with depths ranging from 1 to 5 metres and an average depth of 3 metres. Entry is via the shore. Conditions vary, with mild currents, potential surf, and hazards including entanglement and jellyfish. Species recorded around this area include harbour seals, common lobsters, sea stars, and various jellyfish species. Water temperatures range from 9C to 16C, with the pool occasionally retaining heat from the sun to become warmer than the surrounding ocean.

Thumb Rock is a reef site located 900 metres off the coast of Mullaghmore, Ireland. The reef structure extends to a maximum depth of 25 metres, with the most notable topography found in the shallower sections averaging 15 metres. Divers can expect visibility between 4 and 10 metres. Due to the potential for strong currents and surf, boat access is required. Water temperatures range from 9C to 16C, necessitating the use of a drysuit or thick wetsuit. While the site is suitable for beginners, divers should monitor conditions closely as swells can develop rapidly on this stretch of the Atlantic coast.

Thumb Rock is an offshore limestone reef located 370 metres from the shore at Mullaghmore. The site features vertical walls that descend to depths between 10 and 25 metres. Due to the presence of strong currents and surf, this location is suitable for advanced divers only. Access is by boat, and the site is marked by a buoy. Water temperatures are cold, ranging from 9C to 16C, necessitating the use of thick wetsuits. Visibility at the site typically varies between 4 and 10 metres. The reef structure provides a distinct underwater topography for those exploring the area.