A scrubby, grassed over, underground reservoir which is first depicted on the 1906 OS map. This overlaps somewhat with Brown Spring wood which is depicted on OS maps from 1854 until 1938. The 1st edition OS map of 1854 also shows bell pits indicative of extensive mining activity. Prior to mining the area formed part of Kimberworth Deer Park. Legibility of the former landscape is invisible. Presumably the construction of the reservoir destroyed all trace of the bell pits.