Zabulistan (Persian/Pashto: زابلستان; Zabol + -stan), also spelled Zabolestan, is a historical region in the border area of today's Iran and Afghanistan. The name translates to "land of Zabul" or "land of the Zabuls". The name "Zabuls" is probably a transliteration or translation of Zunbils, a dynasty that ruled the area before the Islamic conquest of Afghanistan.
Read more about Zabulistan: History of Zabulistan, Sakawand A Pilgrimage Centre