Explanation:

Rarh region is a toponym for an area in the Indian subcontinent that lies between the Chota Nagpur Plateau on the West and the Ganges Delta on the East. Although the boundaries of the region have been defined differently according to various sources throughout history, it is mainly coextensive with the state of West Bengal, also comprising parts of the state of Jharkhand in India. Linguistically, the region is defined with population speaking the Rahr Bangla local dialect.