 In the Middle Ages the Maltraeth estuary was tidal, stretching as far inland as Llangefni and Ceint.In 1790, an act of parliament was obtained for more effectually embanking the marshes called Malltraeth and Corsddeuga, under the provisions of which 230 acres (93 ha) were allotted to the several proprietors of land in the parish of Llangaffo.The of reclaimed alluvium at the mouth of the River Cefni subsequently underwent considerable improvements in the late 18th century and early 19th century with the introduction of embankments and flood mitigation measures.