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River Mellte
Afon Mellte or the River Mellte is a river in Wales. It is formed by the confluence of the Afon Llia and the Afon Dringarth. It then flows south through the village of Ystradfellte to Pontneddfechan where it joins with the Nedd Fechan to become the River Neath ((ウェールズ語:'Afon Nedd')). The river derives its name from Mellt - the Welsh word for 'lightning' - after its tendency to rise and fall rapidly in response to heavy rainfall.
== Underground section ==
The entire river runs underground for 1/2 km at Porth yr Ogof as it crosses the Carboniferous Limestone outcrop. It resurges at Pwll Glas. There are fifteen known entrances to the cave system. It is a complex maze of passageways, large and small, mostly developed along one or two major bedding planes. In extreme flood conditions the entire cave can flood to the roof. It is used heavily by school and adventure groups though sections of the cave can be hazardous for the unwary. There have been a number of fatalities over the years.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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