---
title: "Bay of Bengal Branch of the Southwest Monsoon — Definition"
description: "The Bay of Bengal branch is the eastern arm of the southwest monsoon, feeding rain to northeast India and the Gangetic plain. Key UPSC GS1 mechanism explained."
url: "https://modeldiplomat.com/learn/glossary/bay-of-bengal-branch-monsoon"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- The Bay of Bengal branch is the easterly arm of the Indian southwest monsoon that carries moisture from the Bay of Bengal across eastern and northern India.
- How does the Bay of Bengal branch differ from the Arabian Sea branch?
- Why does Cherrapunji (Sohra) and Mawsynram receive such extreme rainfall?
- Why does rainfall from this branch decline from east to west along the Gangetic plain?
- What role do monsoon depressions play in this branch?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

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Example

The India Meteorological Department's 2022 monsoon advance charts tracked the Bay of Bengal branch reaching the northeastern states and Kolkata by early June, ahead of its westward progress up the Gangetic plain.

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