H.G. Keene 
The Fall of the Moghul Empire [EPUB ebook] 

THE country to which the term Hindustan is strictly and properly applied may be roughly described as a rhomboid, bounded on the north-west by the rivers Indus and Satlej, on the south-west by the Indian Ocean, on the south-east by the Narbadda and the Son, and on the north-east by the Himalaya Mountains and the river Ghagra. In the times of the emperors, it comprised the provinces of Sirhind (or Lahore), Rajputana, Gujrat, Malwa, Audh (including Rohilkand, strictly Rohelkhand, the country of the Rohelas, or ‘Rohillas’ of the Histories), Agra, Allahabad, and Dehli: and the political division was into subahs, or divisions, sarkars or districts; dasturs, or sub-divisions; and parganahs, or fiscal unions.