Consists of correspondence, press releases, press cuttings, and posters relating to Ymgyrch Argae Ilisu / Ilisu Dam Campaign Cymru which held a rally in Tryweryn in January 2001, in support of the Kurdish people of South East Turkey. They campaigned to stop British involvement in building the Ilisu Dam on the River Tigris.

The file includes information regarding the designation of the Brecon Beacons as a national park, proposed nuclear power stations at Trawsfynydd and Edern, Liverpool Corporation water scheme in Cwm Tryweryn and the Clywedog reservoir.