Dunure Castle Skerries offers a unique coastal dive beneath the ruins of a 13th-century castle. The site features rocky headlands and skerries that support diverse seaweed communities and patches of seagrass. Divers and snorkellers can expect to encounter a variety of temperate marine life typical of the region, including various invertebrates and reef fish. This shore-entry site is suited for intermediate divers due to the presence of mild currents and potential rip currents. Water temperatures range from 8C to 16C throughout the year. Hazards include cold water, jellyfish, sea urchins, and surf. Facilities available at the location include parking, toilets, and a cafe.

Clauchlands Farm is a sheltered site located on the northeast side of Lamlash Bay. The topography consists of rocky reefs, kelp forests, and seagrass beds, situated within the South Arran Marine Protected Area. This shore entry site is suitable for beginners and offers a snorkel rating of 4/5. Divers and snorkellers can expect to encounter a variety of temperate marine life typical of the region's reef and kelp habitats. Water temperatures range from 8C in winter to 16C in August. Be aware of boat traffic in the area. Parking is available, and guided tours can be arranged for those visiting this coastal location.

Black Rock is located within Scotland's first community-led No Take Zone in the Sound of Mull. This protected area features significant seagrass meadows and maerl beds, which provide a stable habitat for local marine life. The site is accessible via a shore entry and is suitable for beginners, holding a high rating for snorkelling. Water temperatures in this region vary throughout the year, ranging from 8C in the late winter months to 15C during the summer. As a protected zone, the site offers a unique opportunity to observe a habitat free from fishing activity.

Keppel Pier at the Field Studies Council in Millport offers accessible snorkelling in the Oban and Sound of Mull region. The site is suitable for beginners and provides both shore and boat entry options. Underwater, the pier pilings are encrusted with marine life, supporting a diverse range of species. Snorkellers may encounter sea stars, including common and red comb varieties, alongside various crab species like the European green crab. Other recorded sightings include gray seals, catsharks, and several types of jellyfish. Water temperatures fluctuate between 8C and 16C throughout the year, with the site maintaining a snorkel rating of 4/5.

Millport Bay is a shore-entry reef dive located in the Oban and Sound of Mull area. The site is well-suited for beginners, featuring a reef structure at depths between 10 and 13 metres. Divers can expect mild currents and visibility ranging from 5 to 10 metres. Water temperatures fluctuate between 8 and 15 degrees Celsius throughout the year, making a drysuit strongly recommended for comfort. As conditions and access arrangements can change, it is advisable to check locally for the latest information and facility availability before planning a dive. This site offers a straightforward environment for those building cold-water experience without the need for a boat charter.

Wishing Well is a shore-entry site located on the east side of the island, featuring a cleared pathway through the rocks that leads directly into a kelp forest and boulder reef. The site is suitable for beginners, with depths ranging from 8 to 30 metres and an average depth of 15 metres. Divers can expect moderate currents and visibility between 5 and 10 metres. Species recorded around this area include various sea stars, crabs, catsharks, and seals. Facilities at the site include parking and air fills. Typical dives last approximately 45 minutes, and the site is also suitable for snorkelling.

Horse Rock in Strangford Lough is a reef site featuring volcanic rock formations accessible via a sandy causeway from the shore. The site is suitable for beginners, with depths starting at 1 metre. The seaward side of the rock provides deeper water for more experienced snorkelers. Conditions vary, with moderate currents and potential surf. Water temperatures fluctuate between 8C and 16C, necessitating a dry suit with a warm undersuit for most of the year. Facilities including parking, toilets, and a cafe are available nearby.

The SS Kintyre is a wreck dive located 310 metres from shore in the Sound of Mull. Divers typically access the site via boat or shore, navigating a pipe that descends from 8 metres to 30 metres. The wreck itself lies at depths reaching 32 metres, with the site profile extending down to 50 metres. Due to moderate currents and potential down currents, this site is suitable for advanced divers only. Visibility is limited to 3 to 5 metres, and water temperatures range from 8C to 16C throughout the year. Divers should be prepared for cold water, decompression requirements, and overhead environments while exploring the wreckage.