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Most people don't know that there's a place on Earth where gravity is so low that the sea level itself dropped over a hundred meters. This area, known as the Indian Ocean Geoid Low, has a gravitational pull that is much weaker than anywhere here on Earth. This circular depression starts just off India's southern tip and covers a total area of about 3 million square kilometers. The reason why gravity is so low in this region can be traced all the way back over tens of millions of years ago when India was a completely different place. This was because there was an ocean in between the Indian Plate and Asia. Eventually, the ocean disappeared and the gap with Asia closed. As the oceanic plate went down inside the mantle, it led to the formation of plumes, an upward flow of hot material from the Earth's mantle. This brings low-density material closer to Earth's surface, making gravity weaker than what it's supposed to be.