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In ancient period, Iran was applied to the country which had dominated on extensive ristrict of west and east teritories. Since of benifiting from this geographical location, not only established a relation between west and east empires, bUt also most cultures and sciences of the time were b_flunced deeply.
Excessive intrest of Iranian to commercial affairs caused to procure different facilities and installation as well as security for road ways. The course of this roads passed from Euphrates and Tigris rivers to Harah, Nasibane then reached to Sardes and Efce. The lenght of this long road reached to 2683 kilometers.
About 111 stations or carvanserais were equipped with spare horses
for messengers. This course was travelled in 90 days by commercial carevans.
The first joumey of political boards from China court was headed by
Chezan Naissan to the court of Iran accomplished in 228 years B.c. During the time of the AJhkanian Jecond merdad chineJ silk from the
road entitled silkroad, from north of Iran was despatched to the Roman
empire.