Borth Wen and Aber Geirch (both of which are included in a book on Wales' secret beaches) are probably the least appealing of all of the Llyn Peninsula beaches. Borth Wen (above) is a small beach of rocks and shingle, with a few small patches of sand and backed by banks of sand and boulder clay. There are no obvious paths down, but scrambling down is easiest at the eastern end.
About ½ mile further west, Aber Geirch (Grid Ref: SH265403) sits at the end of an often muddy valley and can be reached by public footpaths from the village of Edern. The Afon Geirch flows across the beach of mostly shingle and rotting seaweed, which on warm days creates an unpleasant smell. A pipeline runs along one side.
Both beaches border a busy golf course and are hardly secret, and as beaches go, you wouldn't want to spend time at either of them.