What is the longest distance between any two places on earth?

 The longest distance between any two places on Earth is the antipodes – points that are diametrically opposite each other on the Earth's surface. These antipodal points create the longest possible straight-line path that can be drawn through the Earth's center.

The antipodal points are often on land to land or ocean to ocean due to the majority of the Earth's surface being covered by water. For instance, the antipodal point of a location in China might be in South America, or the antipodal point of a place in the United States might be in the Indian Ocean.

The actual distance between antipodal points varies because the Earth is not a perfect sphere; it's slightly flattened at the poles and bulges at the equator. The longest straight-line path that can be drawn on Earth, however, is approximately 20,000 kilometers (12,427 miles) and passes through the Earth's center.