Original: During its existence , the Sassanid Empire encompassed all of today 's Iran , Afghanistan , Iraq , Syria , the Caucasus ( Armenia , Georgia , Azerbaijan and Dagestan ) , southwestern Central Asia , part of Turkey , certain coastal parts of the Arabian Peninsula , the Persian Gulf area , and areas of southwestern Pakistan .
Simplified: The Sassanid Empires traditional territory included all of todays Iran , Iraq , Armenia , Afghanistan , eastern parts of Turkey , and parts of Syria , Pakistan , Caucasia , Central Asia and Arabia .