It is fascinating how beaches can vary so much even within a relatively short radius, in terms of the beach composition and the kinds of organism that inhabit it, and the types of debris washed ashore. Rhossili Bay where these pictures were taken is a beach miles long, just like Swansea Bay. Rhossili Beach is clean sand right down to the water’s edge and beyond, and there are rocky promontories at each end of the shore. The location is an exposed one. This compares with Swansea Bay, superficially alike but where the sand gives way to more muddy sediments from mid tide level down to the sublittoral, and the nearest hard substrates are the docks and Mumbles respectively at the east and west ends of the seashore. The location of Swansea Bay, at the landward base of Gower, is more sheltered than Rhossili at the extremity of the Gower Peninsula. Consequently, the range and identity of the molluscs, marine invertebrates, and seaweeds, differs in the two bays because of the varying environment and habitats available for exploitation.