Yaghistan
Yaghistan (Urdu: یاغستان) (The Land of Rebels) was a key frontier region between Afghanistan and British India. This was an area where rebels lived, on either side of the Durand Line.Yaghistani fighters included Pashtuns Yousafzais, mohmand, wazir and Kashmiris who were exiled during Kashmir conflict in 19th century. They all fought against british. For this reason, they were called rebels (baghi)(باغی). History
Yāg͟histān was originally inhabited by Indo-Aryan Kōhistānī speakers. Many areas of Pakhli were also part of Yaghistan. Yāghistān was the center of Mahmud Hasan Deobandi's Silk Letter Movement. The area was never conquered by the British Raj and its people and the unadministered tribes always remained hostile towards the British. According to the Encyclopaedia of Islam, Yaghistan "referred to different sanctuaries used by Mujahideen against the British authorities from early 19th to late 19th century, in the various independent tribal areas, mainly inhabited by the Pashtun, Kashmiri and Kohistani people in the hinterland of what became the North-West Frontier Province (NWFP) of British India such as the Mohmand Agency, Bunēr, Dīr, Swāt, Kohistān, Hazāra ." Notable people
 Akbar Yaghistani, a student and companion of Mahmud Hasan Deobandi who participated in the Silk Letter Movement

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Further reading
 
 

Geography of Afghanistan
British India
Regions of Afghanistan