http://www.ccgc.gov.uk/landscape--wildlife/protecting-our-landscape/special-landscapes--sites/protected-landscape/sssis/current-sssis-in-wales.aspx?lang=cy-gb Gwefan Cyngor Cefn Gwlad Cymru (bellach 'Cyfoeth Naturiol Cymru')]; (in Welsh) accessed 25 December 2013 – The estuary has an area of 5851 hectares .