Large V-shaped fish trap, set low down on stony foreshore, constructed of stone. Each arm meaures c.130m in length. To its south is a far smaller V-shaped fish trap, Mynachdu'r Graig Fish Trap II (NPRN 409085). A third fish trap (NPRN 418329) is located some 190m to the north-east. It is `C? shaped, and measures some 50m from end to end. It lies at about the same distance from the cliff as Mynachdu'r Graig Fish Trap II. This fish trap was identified during RCAHMW aerial reconnaissance on 2nd June 2009.

T. Driver, RCAHMW, 12th June 2009.