There are 2,573 disused coal tips in Wales, predominantly in the South Wales valleys, and it is estimated there are over 20,000 other disused tips (i.e. not coal) in Wales.
Mae 2,573 o domenni glo nas defnyddir yng Nghymru, yn bennaf yng nghymoedd y De, ac amcangyfrifir bod dros 20,000 o domenni eraill nas defnyddir (hy.