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Sad-i Iskandar, Alexander's Wall in the Gurgan Plain, Iran. Iran's share of the Turkmenian steppe - a 180 kms long limes with 36 forts against the marauding nomads from the North. Constructed by the Parthians, mot probably by King Mithridates II. (123 - 87 BC) Illicit diggers left their traces on the wall and in its forts. (KEYSTONE/Georg Gerster)