The Indian monsoon system is characterized by two main branches: the Bay of Bengal branch and the Arabian Sea branch. Understanding their paths and interactions is key to determining where they merge.

Understanding Monsoon Branch Paths

The Indian monsoon primarily originates from the southwest. As the monsoon advances, it splits into two distinct currents:

• Arabian Sea Branch: This branch moves towards the west coast of India. It often splits further, with one part moving northwards over central India and the other progressing towards the northern plains.
• Bay of Bengal Branch: This branch moves towards the northeastern part of India and then curves westwards, travelling across the northern plains.

Identifying the Merger Point

The crucial point where these two monsoon currents meet and interact is essential for understanding the rainfall patterns across North India. Let's analyze the options:

• Southern Part of Peninsular India: While the monsoons affect the peninsula, this is not the primary merger point for both major branches.
• Coromandel Coast: This coast (eastern side of the peninsula) typically receives rainfall from the retreating monsoon (northeast monsoon), not the primary merger of the southwest monsoon branches.
• North Western Part of Ganga Plains: This region is a significant meeting ground. The Arabian Sea branch, after moving across central India, pushes northwestwards, while the Bay of Bengal branch moves westward across the plains. Their confluence here influences the weather systems affecting Northwest India and the upper Gangetic plain.
• North of Deccan Plateau: While the Deccan Plateau is affected, the specific merging zone for both branches extends further north into the plains.

Merger Location Explained

The Bay of Bengal Monsoon Branch advances across the plains of North India. Simultaneously, the Arabian Sea Branch moves inland, penetrating deep into the subcontinent and extending its influence towards the northern plains, often reaching the northwest. The convergence of these two moisture-laden air masses typically occurs over the North Western Part of Ganga Plains. This merging zone is critical as it leads to widespread rainfall and significant weather activity in these areas, marking the effective culmination of the initial monsoon burst from both directions.