This document summarizes the historical formation and geographic impacts on the ancient region of Dinajpur in Eastern Bengal. It discusses how the region was known by different names over historical periods under different rulers, including Kirat-bhumi, Pragjyotishpur, Pundravardhana, Kotivarsha, Mahasthangarh, Barind, Kamrupa-Kamta. Many cities were built and destroyed over time as the geography and boundaries changed. Dinajpur city was established in the late 18th century after the British defeated the last Muslim ruler and established their rule, making Dinajpur the headquarters of the new district they formed in Eastern India.