Sistan & Baluchestan
Baluchistan is the southeasternmost region of Iran, along the country's border with Pakistan. The native language of the region, Baluchi, related to ancient Persian, is spoken in western, southern, and eastern parts of the region.
In Sistan & Baluchestan
Zahedan is the capital of Baluchistan province in Iran. If you're not going through Afghanistan you'll have to pass through Zahedan on the overland route from Istanbul to New Delhi.