The Ganga River, also known as the Ganges, is one of the most important rivers in India and Bangladesh. It originates in the western Himalayas in India and flows through several states before entering Bangladesh. In Bangladesh, the Ganges River joins the river Meghna and together they flow out to the sea.

Here is a detailed explanation of the answer:

The Ganges River is formed by the confluence of two rivers, the Bhagirathi and the Alaknanda, at Devprayag in Uttarakhand, India. It then flows through the states of Uttar Pradesh, Bihar, and West Bengal before entering Bangladesh.

In Bangladesh, the Ganges River splits into two main distributaries, the Padma and the Jamuna. The Padma River is the main distributary of the Ganges in Bangladesh. It is formed by the confluence of the Bhagirathi-Hooghly River, which is the main distributary of the Ganges in West Bengal, India, and the Jamuna River.

The Jamuna River is the other distributary of the Ganges in Bangladesh. It is formed by the confluence of the Brahmaputra River, which originates in Tibet and flows through India and Bangladesh. The Brahmaputra River, along with the Ganges and Meghna rivers, forms the largest delta in the world, known as the Ganges-Brahmaputra-Meghna (GBM) delta.

The Padma River and the Jamuna River meet near the capital city of Dhaka in Bangladesh and form the Meghna River. The Meghna River then flows southwards and eventually merges with the Bay of Bengal, which is part of the Indian Ocean.

In summary, the Ganges River joins the river Meghna in Bangladesh, and together they flow out to the sea as the Meghna River.