Map of the Sassanid, Byzantine and Muslim borders.
This file was derived from:

 IslamicConquestsIroon.png: 
Pre Islamic Arabia-es.svg: 
Coast, rivers, sea: Natural Earth (Oblique stereographic projection, +proj=stere +lat_0=27.209842248276647 +lon_0=44.208984375  +datum=WGS84 +units=m +no_defs)
Javierfv1212, HistoryofIran, rowanwindwhistler