Schoinos, which means ‘rope’ in Egyptian was an ancient unit of measurement which was the equivalent of 40 stadia but had huge regional variations ranging from 30 to 120 stadia(a). It was widely used throughout the Mediterranean and was adopted by the Greeks from the Egyptians around 2000 BC(d).
Albert Herrmann, quoted by Bramwell [195.117], attempted to make sense of the dimensions of the ditch surrounding the Plain of Atlantis by suggesting that Solon had been misled by an interpreter who converted the Egyptian measurements into Greek ‘podes’ (feet) but erroneously gave the results as ‘stadia’ exaggerating the data by a factor of thirty!
However, for me, Herrmann’s highly speculative theory makes little sense, if the ‘schoinos’ was used by the Greeks since 2oooBC, why convert it at all? Herodotus refers to it at least twice in his Histories (2.6(b) and 2.149(c))