---
title: "Bay of Bengal branch — Definition & Meaning | Model Diplomat"
description: "The Bay of Bengal branch is the easterly arm of the Indian summer monsoon, crucial for rainfall in northern India and the Gangetic plains."
url: "https://modeldiplomat.com/learn/glossary/bay-of-bengal-branch"
---

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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 summer monsoon that sweeps from the Bay of Bengal across northeast and northern India, bringing the bulk of rainfall to the Gangetic plains.
- Why does the Bay of Bengal branch cause the world's heaviest rainfall at Mawsynram and Cherrapunji?
- How does the Bay of Bengal branch enter India and why does it bend westward?
- What explains the east-to-west decrease in rainfall along the Gangetic plain?
- How do the Bay of Bengal and Arabian Sea branches differ?

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

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The India Meteorological Department recorded the Bay of Bengal branch reaching Kolkata and advancing across Assam in early June 2023, triggering the orographic deluge over Mawsynram in the Meghalaya hills.

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