What is "zabulistan"

Zabulistan ( Persian/ Pashto: ; Zabul + -stan), originally known as "Zavolistan", is a historical region roughly corresponding to today's Zabul Province in southern Afghanistan. Zabulistan translates to "land of Zabul" or "land of the Zabuls". The name "Zabuls" is probably a transliteration of Zunbils, a Hindu and Buddhist dynasty that ruled the area during the Islamic conquest of Afghanistan.