Rangamati Hill District, is a district in south-eastern Bangladesh. It is a part of the Chittagong Division
and the town of Rangamati serves as the headquarters of the district. By area, Rangamati is the largest district of the country.
Wikipedia https://en.wikipedia.org/wiki/Rangamati_Hill_District
Coordinates 22°51'5.934" N 92°16'28.787" E