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But Polycleitus says, that the Euphrates does not overflow its
banks, because its course is through large plains; that of the mountains
(from which it is supplied), some are distant 2000, and the Cossæan
mountains scarcely 1000 stadia, that they are not very high, nor covered
with snow to a great depth, and           do not occasion the snow to
melt in great masses, for the most elevated mountains are in the
northern parts above Ecbatana; towards the south they are divided,
spread out, and are much lower; the Tigris also receives the greater
part of the water [which comes down from them], and thus overflows its
banks.