The constitution of the sloping beach varies with the currents and storms, mostly it's grit, sometimes shingle, sometimes even sand. (North Beach has become much more sandy since cyclones Anne and Christina hit in January 2014.) A few rocky outcrops, especially beside the pier, reveal tidal pools which attract kids with fishing nets and 6th form students on field trips. The environment agency regularly measure the murky water quality on Aberystwyth's main beaches . Unstable Web Site Semi-polished multicoloured pebbles can be found under the pier and below Constitution Hill, though care should be taken as there are strong undercurrents here. In the summer, with patience, it's sometimes possible to spot Bottlenose dolphins and Harbour porpoise out in the bay. Grey seals from the Irish Sea overwinter on the local coastline.
Once one of the busiest in Wales, the harbour is situated at the south end of town and fed by the rivers Ystwyth and Rheidol (which is the steepest river in Britain). A couple of years ago the harbour had a 'make-over' and was turned into a Marina. The harbour is highly tidal so it's important to refer to the tide tables if approaching by sea.