Tags: Site Of Special Scientific Interest.
Dyffrynnoedd Nedd a Mellte a Moel Penderyn (grid reference SN921090) is a 421.1 hectare biological and geological Site of Special Scientific Interest on the border of Neath Port Talbot and Powys Wales notified in 1954.The name of the site means The valleys of Nedd and Mellte and Moel Penderyn.This site includes the wooded valleys of the rivers Nedd and Mellte and their tributaries above Pontneddfechan as they pass through a millstone grit and limestone plateau and the hill of Moel Penderyn which lies to the east.