The population of the province is mostly comprised of Baluch people. In Sistan and Baluchestan, the people mostly speak Baluchi language.
The province is one of the driest regions of Iran with a slight increase in rainfall from east to west, and an obvious rise in humidity in the coastal regions.
The province is subject to seasonal winds from different directions, the most important of which is the 120-day wind of Sistan known as Levar.
The province borders South Khorasan Province in the north, Kerman Province and Hormozgan Province in the west, the Gulf of Oman in the south, and Afghanistan and Pakistan in the east.
In the epigraphs of Bisotoun and Persepolis, Sistan is mentioned as one of the eastern territories of Darius the Great. The name Sistan is derived from Saka (also sometimes Saga, or Sagastan), a Central Asian tribe that had taken control over the area in 128 BC.
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