Which river system carries the Ganges through Bangladesh?

In Bangladesh, the Ganges River is known as the Padma River.12

Upon entering the country from the west, the river is referred to as the upper Padma. As it flows southeast, it joins the Jamuna River (the name for the Brahmaputra River in Bangladesh) to form the lower Padma. This combined flow continues southeast until it meets the Meghna River near Chandpur, eventually emptying into the Bay of Bengal. The Padma and its deltaic streams constitute one of the five major river systems of Bangladesh.123