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also known as Trelleck, Tryleg, or Woolpit Woods Iron Works
in Woolpitch Wood, Trellech, south of Monmouth, Monmouthshire
The remains of this fenced-off 17th C. blast furnace are just visible through the overgrowth.
The masonry base is 26 ft square at the base. The ground rises steeply on the west side, and there was evidence of the foundations of a bridge arch which would have connected the charging platform with the trackway above. Beyond the trackway were the remains of an associated building measuring 60 ft by 20 ft. Below the furnace is a stream which could have provided water power.