Queenie Reef in Loch Creran is a distinctive site featuring a reef and wall structure. It is one of only two locations globally where serpulid worms form massive biogenic reefs, creating fragile, colourful structures alongside dense mats of brittle stars. Divers can expect depths ranging from 6 to 25 metres, with an average depth of 12 metres. A freshwater layer at the surface may cause a shimmering effect, and a thermocline is often present. Conditions vary with visibility between 3 and 10 metres and mild currents. This shore-entry site is suited for intermediate divers and offers excellent snorkelling opportunities. Facilities including parking, showers, and air fills are available nearby.

Creagan is a high-energy marine site located on the north shore of Loch Creran near the Creagan Inn. The topography consists of a mix of reef and artificial reef structures, offering diverse seabed types. Divers can expect depths ranging from 3 to 25 metres, with an average depth of 14 metres. Access is via the shore, though the site is subject to strong currents and boat traffic. Due to these conditions, the site is suited for intermediate divers. Visibility at the site typically ranges between 3 and 10 metres. Facilities available at the location include parking, showers, and a cafe.

The SS Breda is a Dutch freighter from the Second World War located in the Sound of Mull. The wreck sits upright on the seabed at depths ranging from 12 to 35 metres, with an average depth of 18 metres. Access to the site is by boat only, situated 2400 metres from the shore. Divers may encounter a halocline and thermocline, creating a noticeable difference in water colour and salinity between the surface and deeper sections. The site is suitable for intermediate divers and offers an overhead environment. Snorkellers can explore the upper decks, though the deeper sections are restricted to scuba divers.

SAMS Beach is a horseshoe bay located in the Sound of Mull, sheltered by rock formations. This site offers shore access for snorkelers, with depths ranging from 2 to 15 metres and an average depth of 7 metres. The underwater topography consists of reefs and kelp forests. Conditions are generally mild, making this a suitable location for beginners. Facilities available at the site include parking, a cafe, and showers. The site is situated next to the Scottish Association for Marine Science.

Ganavan Sands in Oban offers an accessible shore entry via a concrete ramp, leading into a bay characterised by a mix of sandy bottom, rocky outcrops, and seagrass beds. This site is suitable for beginners, with depths ranging from 1 to 8 metres and an average depth of 4 metres. Snorkellers can explore the kelp forest and seagrass habitats, which support a variety of regional marine life and invertebrates. Conditions are variable with mild currents and visibility typically between 5 and 10 metres. Water temperatures are cold, ranging from 4°C to 14°C. Hazards include boat traffic, cold water, entanglement, jellyfish, and low visibility.

Heather Island offers a diverse underwater experience within the Sound of Mull, featuring a wall, a cave system, and a wreck in one location. Suitable for beginner divers, the site provides a variety of topography without significant currents. Depths range from 15 to 30 metres, with an average of 20 metres. Visibility typically varies between 5 and 10 metres. Due to water temperatures ranging from 8 to 14 degrees Celsius, a drysuit or a minimum 7mm wetsuit with hood and gloves is strongly recommended. Boat access is required for this site, and local facilities provide air fills, equipment rental, and boat charters.

Gallanach Reef is a granite rock formation rising from a depth of 9 metres to 1.5 metres below the surface. This site features a wall and reef topography suitable for beginner divers and navigation practice. Located within the Sound of Mull, the area offers sheltered waters, though divers should remain aware of boat traffic and potential current. Shore access is available, with high tides providing the easiest entry and improved visibility. The average depth is 10 metres, with a typical dive duration of 40 minutes. Facilities including parking, toilets, and air fills are available nearby.

Carnoch Bay in Ballaculish offers diverse diving opportunities ranging from open water to technical levels. Dives directly from the bay reach a maximum depth of 12 metres, while further options are accessible from the end of the bay following a 100-metre walk. Conditions feature variable currents, and divers must remain aware of potential boat traffic. Due to these conditions, the use of a delayed surface marker buoy is required. The site is suitable for various skill levels, though good buoyancy control is recommended for the deeper areas, which extend to 50 metres. Divers should be prepared for cold water temperatures typical of the region.