The Brahmaputra is not a tributary of the Ganga; rather, it is a major river in its own right with its own basin. The Yamuna, Ramganga, and Gomti are tributaries of the Ganga, contributing to its water and sediment load.

Major Tributaries of the Ganga
The Ganga river, also known as the Ganges, is one of the most important and sacred rivers in India. It is fed by numerous tributaries that help sustain its flow and provide water to the regions it passes through. Among these tributaries, the major ones include the Yamuna, Ramganga, and Gomti rivers.

Yamuna River
- The Yamuna river is one of the largest tributaries of the Ganga.
- It originates from the Yamunotri Glacier in the Himalayas.
- The Yamuna flows through several states in northern India before merging with the Ganga in Allahabad.

Ramganga River
- The Ramganga river is another important tributary of the Ganga.
- It originates in the Doodhatoli range of the lower Himalayas.
- The Ramganga river joins the Ganga near the town of Kannauj in Uttar Pradesh.

Gomti River
- The Gomti river is also a significant tributary of the Ganga.
- It originates in the Gomat Taal in Pilibhit district of Uttar Pradesh.
- The Gomti river meets the Ganga near the city of Varanasi.

Brahmaputra River
- The Brahmaputra river is not a major tributary of the Ganga.
- It is a separate river that originates in Tibet and flows through India and Bangladesh.
- The Brahmaputra river eventually merges with the Ganga in Bangladesh to form the Padma river.
In conclusion, while the Yamuna, Ramganga, and Gomti rivers are major tributaries of the Ganga, the Brahmaputra is a separate river that does not directly contribute to the flow of the Ganga.