evidence: Houchang Chehabi, professor of International Relations and History at Boston University, explains the history of the Shatt al-Arab, the river that divides Iraq and Iran. [...] SIEGEL: Like many places along borders of countries that speak different languages, the Shatt al-Arab also has a Persian name, the Iranians would refer to it, not necessarily as the Shatt al-Arab, I gather? [...] SIEGEL: This is Professor Houchang Chehabi of Boston University talking with us about the Shatt al-Arab waterway, the river that separates Iran from Iraq.