Mount Chimborazo, located in Ecuador, has an elevation of 20,548 feet above sea level, making it the highest point on Earth when measured from the center of the Earth. However, Mount Everest, located in the Himalayas, has a higher elevation of 29,029 feet above sea level, making it the tallest mountain in the world when measured from sea level. The reason for this difference is that the Earth is not a perfect sphere, but rather an oblate spheroid, meaning it bulges at the equator and flattens at the poles. This means that Mount Chimborazo is closer to the Earth's center than Mount Everest, giving it a greater overall height from the center of the Earth, but not from sea level.