Hyderabad State
At the time of the Independence movement of India, the State of Hyderabad was the largest of the princely states in India.  The Nizams of Hyderabad ruled over lands extending to cover 82,698 mi² (214,190 km²) of fairly homogenous territory, bigger than Belarus but smaller than Guyana.  The Nizam ruled over a cosmopolitan population of roughly 16.34 million people (as per the 1941 census).  These advantages persuaded the Nizam to attempt an Independent existence when the British withdrew from the sub-continent in 1947.  He refused to join either a Hindu India or a Muslim Pakistan, preferring to form a separate Kingdom within the British Commonwealth of Nations.  Hyderabad State had its own Army, Airline, Telecommunication system, railway network, postal system, currency and Radio broadcasting service.