Hushinish Slipway Advanced Zone is a rugged snorkelling site located on the far side of the headland from the main beach. The topography is defined by dense kelp forests and deeper water, with depths ranging from 15 to 35 metres, averaging 15 metres. This site is suitable for advanced snorkellers due to strong currents and potential surf. Visibility typically ranges between 15 and 30 metres. Water temperatures are cold, fluctuating between 8C and 14C throughout the year, requiring appropriate thermal protection. Hazards include entanglement in kelp and strong currents. Facilities at the site include toilets and showers.

Seilamol Bay is a sheltered location on the North Harris Snorkel Trail, offering a variety of marine habitats including seagrass meadows and kelp forests. This site is suitable for beginners, with depths ranging from 2 to 7 metres and an average depth of 4 metres. Access is via the shore, and the site experiences mild currents. Visibility typically fluctuates between 3 and 10 metres. Due to water temperatures ranging from 8C to 14C, thick wetsuits are required for comfort. Hazards at this location include cold water, jellyfish, and surf. Guided tours are available for those wishing to explore the area.

Àird Àsaig is a sheltered marine site in the United Kingdom featuring a sandy seabed and extensive kelp forests. The inner bay provides a calm environment suitable for beginners, while the outer headland offers more complex topography for experienced snorkellers. Depths start at 1 metre, with visibility ranging from 8 to 30 metres. The water is cold, ranging from 8C to 14C throughout the year, necessitating a dry suit with a warm undersuit for most months. A thick semi-dry suit may suffice from late spring to early autumn. Access is via the shore, and facilities include parking and a cafe. Be aware of boat traffic in the area.

Loch Mhàraig is a sheltered sea loch in the Outer Hebrides that offers a distinct environment compared to open coast locations. The site is suitable for beginners and provides shore access via an old slipway. Water temperatures fluctuate between 8C and 14C throughout the year, with the coldest conditions occurring in February and March and the warmest in August and September. Snorkellers can explore the loch's protected waters, which are known to support populations of anemones and shellfish. The site is rated 3 out of 5 for snorkelling, making it a accessible location for those looking to experience the marine life of a Scottish sea loch.

Port Rhenigidale is a sheltered inlet in Scapa Flow offering calm conditions for snorkelers. The site features a reef and kelp forest environment, providing a varied underwater landscape for exploration. Access is via the shore, with parking available nearby. Water temperatures fluctuate between 8C and 14C throughout the year, necessitating a dry suit for most seasons, though a thick semi-dry suit may suffice from late spring to early autumn. Currents are generally mild, making this a suitable location for beginners. Snorkelers should remain aware of the presence of jellyfish and sharks in the area.