The confluence of the Ganges, Brahmaputra, and Meghna rivers has built the vast Ganges Delta, depositing layer upon layer of sediment that created expansive low‑lying plains.
The collision of the Indian and Eurasian plates thrust the Himalayas upward while the land to the south sank, further flattening the terrain.
Seasonal monsoon floods erode some areas and deposit rich alluvium elsewhere, continually reshaping the landscape into broad, level floodplains.
The country's highest point reaches only 1,052 feet (321 m), and there are few hills or mountains, reinforcing the overall flat character.
These combined geological and climatic factors make Bangladesh a predominantly flat, fertile nation ideal for intensive agriculture.