it is within a distance of 2 kilometres from the perimeter of a scheduled monument and is 50 metres or more in height, or has an area of 0.5 hectares or more;
bod o fewn pellter o 2 cilometr o berimedr heneb gofrestredig ac yn 50 metr o uchder neu’n uwch, neu gydag arwynebedd o 0.5 hectar neu fwy;