1. 'Morfa Harlech sand dunes is an extensive dune system stretching northwards from the town of Harlech. The dunes cover 6 km?, of which an area of about 1.5 km? in the middle has been afforested with Corsican Pine. Nearby is Harlech Castle, which due to the expanding dune system has been taken back 1,000 metres (3,300 ft) from its original position on the coastline 600 years ago. Morfa Harlech is one of Britain's actively growing sand dune systems due to the longshore drift which is currently eroding the dunes at Morfa Dyffryn.'

Wikipedia, accessed 20 Feb 2019. RCAHMW

2. Surveyed from the air for the EU-funded CHERISH Project 2017-2021.