Many assumed Iran is an Arab country due to geography and religion, but the truth is rooted in a 2,500-year-old Persian heritage. Know the massive differences in language, ethnicity (61% Persian), and history that set Iran apart from its neighbours. Many assumed Iran is an Arab country due to geography and religion, but the truth is rooted in a 2,500-year-old Persian heritage. Know the massive differences in language, ethnicity (61% Persian), and history that set Iran apart from its neighbours.