it is within a distance of 5 kilometres from the perimeter of a scheduled monument and is 100 metres or more in height, or has an area of 1 hectare or more.
bod o fewn pellter o 5 cilometr o berimedr heneb gofrestredig ac yn 100 metr o uchder neu’n uwch, neu gydag arwynebedd o 1 hectar neu fwy.