The topography of Bangladesh is characterized by its exceptionally flat deltaic plain, which makes up about 80% of the country's landmass. The general elevation of this plain is less than 10 meters (33 feet) above sea level, making it highly susceptible to seasonal flooding and sensitive to sea-level rise.
In stark contrast to the plains, the Chittagong Hill Tracts in the southeast feature rugged, heavily forested hills and deep ravines. Here lies the highest point in Bangladesh, Saka Haphong (unofficially recognized, locally known as Mowdok Mual), which rises to approximately 1,052 meters (3,451 feet).
The lowest point is the Bay of Bengal, sitting at sea level. The country's coastline is highly fragmented by the mouths of the deltaic rivers, except for the southeastern stretch along Cox's Bazar, which boasts one of the longest unbroken natural sand beaches in the world, measuring about 120 kilometers (75 miles).