Garth Hill
The location of the fictional "Ffynnon Garw" above the writer's home village suggests that it is the Garth and the mound on which the trigonometrical point stands is a Bronze Age burial mound . Monger adapted the story for the 1995 film of the same title on which he was the director . The popularity of the film has resulted in a stream of visitors climbing to the summit of Garth Mountain to view the location . 
<triplet> film of the same title <subj> 1995 <obj> publication date