Greater Khorasan
Greater Khorasan included parts which are today in Iran, Afghanistan, Tajikistan, Turkmenistan, and Uzbekistan.
Some of the main historical cities of Persia are located in the older Khorasan: Nishapur (now in Iran), Merv and Sanjan (now in Turkmenistan), Samarqand and Bukhara (both now in Uzbekistan, Herat and Balkh (both now in Afghanistan).