z,
quite true, because most of the mountain ranges were at the limits of islamic power. closer to home, the Caliphate didn't have too much issue punching past the Taurus Mountains to get at the Byzantines.
also, the Byzantines served as a shield for approximately five centuries. If Constantinople had fallen in 717, or worse yet 674, i doubt the mountain barriers would have been enough to turn back the Islamic armies.
Ultimately, Islam never did very well in penetrating past Europe's defensive mountain ranges. The Pyrenees, Alps, Carpathians, Urals all served as a sort of barrier that Islamic Armies were not able to sustain a penetration.
also, the Byzantines served as a shield for approximately five centuries. If Constantinople had fallen in 717, or worse yet 674, i doubt the mountain barriers would have been enough to turn back the Islamic armies.
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