Ynys Lochtyn is a tidal island and headland in Pembrokeshire, United Kingdom, featuring a rugged reef and kelp forest environment. This site is suited for advanced snorkellers due to the presence of strong currents and surf conditions. Access is via the shore, where the topography includes sheltered gullies. Water temperatures fluctuate between 9C and 17C throughout the year. Due to the challenging nature of the currents and potential for entanglement in the kelp, this location requires careful planning and experience. It is a dynamic marine environment shaped by tidal movements.

Tresaith Waterfall Rocks is a distinctive site where a freshwater waterfall cascades directly into the sea. Snorkellers can explore the reef environment around the rocks at the base of the waterfall, which features a mix of marine and freshwater-influenced conditions. Access is via the shore, and the site is suitable for beginners. Conditions include mild currents and water temperatures ranging from 9C to 17C. Due to the cool water, appropriate thermal protection is required to prevent heat loss. Facilities available at the site include parking, toilets, showers, a cafe, and first aid services.

Cwmtydu Cove is a narrow, deep bay in Pembrokeshire, United Kingdom, historically known as a smuggler's cove. The site offers shelter for snorkellers, particularly along the rocky edges that define the bay. Entry is via the shore. Water temperatures fluctuate throughout the year, ranging from 9C in the late winter to 17C during the summer months. Due to the nature of the terrain and the coastal environment, this site is best suited for intermediate snorkellers. There is no specific data regarding marine life at this location.

Dolau Beach is a sheltered coastal site located on the west side of the harbour wall in New Quay. This shore-entry location is suitable for beginners and offers a snorkel rating of 3 out of 5. Water temperatures fluctuate throughout the year, ranging from 8C in the winter months to 18C in August. Facilities available at the site include public toilets and parking. While marine life is not confirmed at this specific location, species recorded around this area include various crabs, snails, shannies, and jellyfish, as well as the occasional gray seal.

Cei Bach in Pembrokeshire offers a quiet shore snorkelling experience characterised by shallow reefs and extensive rock pools. Located at the eastern end of the beach, the rocky point provides a sheltered environment suitable for beginners. Conditions are generally mild, though water temperatures fluctuate between 8C in the winter and 18C during August. Access is straightforward from the shore, with parking and toilet facilities available nearby. As a shallow reef site, it is best suited for relaxed snorkelling sessions rather than deep-water exploration. Divers and snorkellers should be prepared for variable conditions typical of the Welsh coastline.

Mwnt Cove is a sheltered bay in Pembrokeshire, United Kingdom, featuring rocky headlands that flank the beach. The site offers shore access for snorkellers, with underwater topography including caves located along the headlands. Water temperatures at this marine site fluctuate between 9C and 17C throughout the year, with the warmest conditions occurring in late summer. Due to the nature of the coastal environment and the rocky terrain, this site is best suited for intermediate snorkellers. Visitors should be prepared for variable conditions typical of the Welsh coastline.

Bath Rocks, situated just south of the Royal Pier in Aberystwyth, provides a shore-accessible snorkeling site within the town. The topography consists of rocky platforms featuring deep gullies and vertical rock faces. These surfaces are covered in seaweed, creating a distinct underwater environment. Water temperatures at this site vary throughout the year, ranging from 8C in the winter months to 18C in August. Due to the nature of the terrain and the sheltered conditions, this site is suitable for beginners. Snorkelers should be prepared for variable conditions typical of the Pembrokeshire coastline.

Borth Submerged Forest in Pembrokeshire offers a unique snorkelling experience featuring a 4,500-year-old petrified forest. Visible at low tide, the site consists of peat reefs and gullies that provide an atmospheric underwater environment. Access is via the shore, and the site is best suited for intermediate snorkellers due to varying coastal conditions. Water temperatures fluctuate between 8C and 18C throughout the year. While no species are confirmed at this exact location, species recorded around this area include barrel jellyfish, rock crabs, sea stars, spiny spider crabs, European green crabs, shanny, and rockpool prawns.