"Aberfan is a former coal mining village in South Wales, 4 miles (6 km) south of the town of Merthyr Tydfil. The Taff Trail ... runs through Aberfan from Troed-y-rhiw, to Treharris. The River Taff also flows through Aberfan. On 21 October 1966, it became known for the Aberfan disaster, when a colliery spoil tip collapsed into homes and a school, killing 116 children and 28 adults." wikipedia
Aberfan - on BBC Wales 'On this Day'
"21 October 1966: Aberfan - a generation wiped out;It took just five minutes for the coal tip above Aberfan to slide down the mountain and engulf a farm, several houses and a school"