Chattogram (formerly Chittagong) Division is Bangladesh's largest division by area, known for its diverse geography, including coastal plains, the Bay of Bengal port city of Chattogram, hill tracts with indigenous cultures, and the world's longest natural beach at Cox's Bazar, serving as a vital economic hub and boasting rich history, art, and political significance. It's administratively divided into 11 districts, featuring unique ecosystems like St. Martin's Island (the only coral island) and diverse ethnic groups, with Bengali as the main language but also regional tongues like Chittagonian.