Earth
The highest mountain above sea level—the well-known Mount Everest (which is  above sea level)—is not actually the one that is the farthest away from the center of the Earth. Instead, the sleeping volcano Mount Chimborazo in Ecuador is; it is only  above sea level but it is almost at the equator. Because of this, Mount Chimborazo is  from the center of the Earth, while Mount Everest is  closer to it. Similarly, the lowest point below sea level that we are conscious of is the Challenger Deep in the Mariana Trench in the Pacific Ocean. It is about  below sea level, but, again, there are probably places at the bottom of the Arctic Ocean that are nearer to the center of the Earth.