位于金鞭溪中游，原名纸草潭，因清代山民造土纸在此漂洗而名。此潭为一大红石槽，深约2.5M。潭上游溪水湍急，跌宕有声如琴弦。串串雪白水花如滚珠泻玉。潭内水面平静，清澈见底，鱼虾悠游其中。潭边青苔斑斑，绿草茸茸，红与绿相辉映、便小石、小草泛出神奇紫色，故改名“紫草潭”。

The pond lies in the middle part of Golden Whip Stream. Formerly, it is called Paper Grass Pond for in Qing dynasty the inhabitants washed their paper-making clays here. The big red pond is about 2.5m in depth. The upriver rapids sound like the melody of strings. Strands of white waters rush down, which sounds just like the music of pearls down on a jade. The water is still and ease,which is so clear that the pond bottom, the fishes and shrimps are easily seen by naked eyes. Lichens are interspersed on the banks, as well as the green downy glass, which takes on kind of purple color on the stones and grass because of the blending of red of green. So it has changed its name into“Purple Grass Pond”.