The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Critias by Plato: line followed the circular ditch. The depth, and width, and length of this
ditch were incredible, and gave the impression that a work of such extent,
in addition to so many others, could never have been artificial.
Nevertheless I must say what I was told. It was excavated to the depth of
a hundred feet, and its breadth was a stadium everywhere; it was carried
round the whole of the plain, and was ten thousand stadia in length. It
received the streams which came down from the mountains, and winding round
the plain and meeting at the city, was there let off into the sea. Further
inland, likewise, straight canals of a hundred feet in width were cut from
it through the plain, and again let off into the ditch leading to the sea:
these canals were at intervals of a hundred stadia, and by them they
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