Pwll Caerog

The Blue Lagoon to the north of Abereiddi Bay doesn't look too inviting on an overcast day. A former slate quarry with its seaward wall breached to form a small deep bay.

Pwll-caerog, looking across the fields from the Pembrokeshire Coast Path.

Situated on the Trwyncastell headland to the north of Abereiddi Bay. This tower, of uncertain usage (local information board suggests possibility of it being a meeting place for directors of the now defunct Abereiddy Slate Mine, or their ladies), lies just off the Pembrokeshire Coastal Path and gets comparatively few visitors. This is possibly because a "scramble" is required to access the headland, as coastal erosion is steadily severing the headland's link with the main peninsula.

Abereiddy (usual Welsh spelling: Abereiddi) is a hamlet in the county of Pembrokeshire, in south-west Wales. It has a small beach. A large car park adjoins the beach, where in the summer an ice cream van can usually be found.

The Blue Lagoon is a large disused slate quarry, now filled with seawater through a breach in the outer wall. This is 25m deep, according to a nearby Pembrokeshire National Park information board. Despite the name, the water is always a distinct greenish hue, owing to the mineral content within the quarry. The lagoon is a favourite for adventure groups practising Coasteering.

The European Stonechat (Saxicola rubicola) breed in heathland, coastal dunes and rough grassland with scattered small shrubs and bramble, open gorse, tussocks or heather. The male's song is high and twittering like a Dunnock. Both sexes have a clicking call like stones knocking together.

Taken from the coastal path

The complex defences at Caer Aber Pwll (Caerau) define a simple promontory fort to the east and a more heavily defended promontory fort on the west, both utilising the defensive potentials of the steep coastal cliffs. The western fort contains at least one building platform and is enclosed by a complex of up to four banks and ditches thought to represent at least two periods of construction, of uncertain relation, extending over a roughly 172m front. The main, inturned, gateway can be made out on the far side of the earthworks. A second enclosure on the east, about 48m by 34m, may be a fragment of an early enclosure, isolated by redevelopment, an annex, or a separate and later enclosure butting onto the primary work.

The Blue Lagoon is an abandoned slate quarry, now flooded by the sea.

The Blue Lagoon is an abandoned slate quarry, now flooded by the sea. The diving board, soon to be dismantled, was installed for the Red Bull Cliff Diving Event held on the preceding two days.