Padma (Ganges) and Jamuna (Brahmaputra) rivers form the delta in Bangladesh.

The delta in Bangladesh is formed by the convergence of two major rivers, the Padma (Ganges) and the Jamuna (Brahmaputra), making it one of the largest river deltas in the world. Here is an explanation of how these two rivers contribute to the formation of the delta:

Padma (Ganges) River:
- The Padma River, also known as the Ganges in India, originates from the Gangotri Glacier in the Indian Himalayas.
- It flows through India and enters Bangladesh where it is known as the Padma River.
- The Padma River merges with the Jamuna River near Aricha in Bangladesh to form the Meghna River, which eventually empties into the Bay of Bengal.

Jamuna (Brahmaputra) River:
- The Jamuna River, also known as the Brahmaputra in India, originates in Tibet and flows through India and Bangladesh.
- It enters Bangladesh as the Jamuna River and joins the Padma River near Aricha to form the Meghna River.
- The Brahmaputra River brings a significant amount of sediment from the Himalayas, which contributes to the formation and growth of the delta.

Formation of the Delta:
- The convergence of the Padma and Jamuna rivers in Bangladesh leads to the formation of a vast and fertile delta.
- The deposition of sediment carried by these rivers over thousands of years has created a network of distributaries, marshlands, and fertile agricultural land in the delta region.
- The delta is constantly changing due to the shifting courses of the rivers and the deposition of sediment, making it a dynamic and ecologically diverse landscape.

In conclusion, the Padma (Ganges) and Jamuna (Brahmaputra) rivers play a crucial role in shaping the geography and environment of Bangladesh through the formation of the delta.