 This part of the river and the surrounding marshes, part of which is a RSPB reserve, are frequented by a variety of wetland birds which in their turn are preyed on by falcons, hawks and harriers.A cycle trail follows the straightened course of the river as it flows through the marshes.Finally it flows under a bridge carrying the North Wales Coast Railway Line at Malltraeth Sands in the south-west of the island and into the Irish Sea.