Dighinala Upazila: History
Dighinala, the biggest upazila of Khagrachhari zila in respect of area, came into existence in 1916 as a thana and was upgraded to upazila in 1984. It is said that in the long past, Tripura Maharaja Govinda Manikya Bahadur Debbarma dug a big pond (meaning Dighi in Bangla) by the side of a canal (meaning Nala in Bangla). This upazila was under Tripura Kingdom used to be known as "Reangdesh"
It is generally believed that the upazila might have originated its name from above two words Dighi and Nala.