 It is situated on the eastern side of the Afon Cefni River or Afon Fawr Llanfihangel-y-Ceifiog, Llanidan, Llangaffo, Llangeinwen, and Newborough.The vegetation reported from the Malltraeth Marshand and Cors Ddyga consist of reed canary-grass, water-plantain, branched bur-reed, club rush and reed sweet-grass.Spiked water-milfoil, blunt-leaved pondweed, horned pondweed are also reported in the marsh land, apart from rare species of flowering rush, water-violet and marsh stitchwort.