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28/04/2007 10:35 AM

But water soon appears. The river bed has collapsed here in two places, suggesting erosion from below, which is where this little stream vanishes at this point. These features are known as the Water End swallow holes (a SSSI, the best example of its type in England) and are major sinkholes in chalk and a permanent landscape feature. A group of more than 15 swallowholes is to be found here, which collectively drain into both the Colne (West) and the Mimmshall (South). See also the North Mimms walk.