The site is approximately 0.25 miles (0.40 km) inland from the north bank of the River Loughor estuary, covers 6.4 hectares (16 acres) and is 15 metres (49 ft) above sea-level.

They are flooded clay pits, dug to supply local 19th century brickworks and inundated in a great storm in 1896, and are in part of interest for the habitats that have formed in the decades since their creation.

[2] The large pond is populated with spiked water-milfoil (Myriophylium spicatum), Canadian waterweed (Elodea canadensis), yellow-flowered fringed water-lily (Nymphoides peltata), and beds of bulrush (Typha latifolia), common reed (Phragmites australis), sea club-rush (Scirpus maritimus) and grey club-rush (Schoenoplectus tabernaemontani).

They host rushes (Juncaceae) and bulrush, water mint (Mentha aquatica), false fox-sedge (Carex otrubae), great willowherb (Epilobium hirsutum), common fleabane (Pulicaria dysenterica), gipsywort (Lyccous europaeus), branched bur-reed (Sparganium erectum), common marsh-bedstraw (Galium palusrre), and water-plantain (Alisma plantago-aquatica).

[2] More shallow areas of the ponds contain mare's-tail (Hippuris vulgaris) and lesser water-parsnip (Berula erecta), grey willow (Salix cinerea); various-leaved water-starwort (Callitriche platycarpa), brackish water-crowfoot (Ranunculus baudotii) and stonewort (Chara vuloaris).