Sīstān in British Indian frontier policy

Sīstān (Sijistān or Sāgistān) came within the scope of British Indian frontier defence during the Napoleonic era. Lord Minto sent out missions to the Punjab, Sind, Baluchistan, Afghanistan and Persia in order to acquire reliable information about the borderlands. Captain Charles Christie and Lieutenant Eldred Pottinger in 1810 explored the route westward into Persia from Baluchistan. Christie separated from the others at Nushki and travelled to Herat via Sīstān before joining Pottinger in Iṣfahān. According to Christie: Seistan is a very small province on the banks of the Helmind, comprising not more than five hundred square miles, bounded on the north and northeast by Khorasan, on the west by Persia, and on the south and south-east it is separated from Mukran by an uninhabited desert.