Explanation: A rain-shadow region is an area that experiences significantly less precipitation due to the blocking effect of a mountain range. When moist air is forced to rise over a mountain range, it cools and condenses, leading to heavy rainfall on the windward side. As the air descends on the leeward side, it warms and dries, resulting in a rain-shadow effect.
In the context of India, the Western Ghats play a crucial role in creating rain-shadow regions. The Western Ghats run parallel to the western coast of India and are a significant barrier to the monsoon winds. The windward side of the Western Ghats, which faces the Arabian Sea, receives heavy rainfall due to the orographic effect. This is why regions like the Western Ghats themselves and coastal areas like Goa and Kerala are lush and receive abundant rainfall.
On the other hand, the leeward side of the Western Ghats, which includes parts of the Deccan Plateau, experiences a rain-shadow effect. The eastern slopes of the Western Ghats and regions like the Deccan Plateau receive much less rainfall because the mountains have already precipitated most of the moisture from the monsoon winds. This is why the Deccan Plateau, particularly its eastern slopes, is classified as a rain-shadow region.
Another example of a rain-shadow region in India is the Thar Desert, located in the northwestern part of the country. The Thar Desert is situated on the leeward side of the Aravalli Range, which blocks the monsoon winds coming from the Arabian Sea. As a result, the Thar Desert receives very little rainfall, making it one of the driest regions in India.
Mumbai, however, is not a rain-shadow region. It is located on the western coast of India, on the windward side of the Western Ghats. Mumbai receives significant rainfall during the monsoon season because it is directly exposed to the moist winds from the Arabian Sea. Therefore, Mumbai does not fit the definition of a rain-shadow region and is the correct answer to the question.
Understanding the concept of rain-shadow regions is essential for comprehending the diverse climatic conditions across India and how topography influences rainfall patterns. This knowledge is crucial for various fields, including geography, environmental science, and urban planning.