The largest mountain ranges on Venus are Maxwell Montes, Akna Montes, and Freyja Montes. Maxwell Montes, located in Venus's Ishtar Terra region, is the highest mountain range on the planet, with peaks reaching about 11 kilometers above Venus's mean surface level. Akna Montes and Freyja Montes are also significant ranges, found in the western and northern parts of Ishtar Terra, respectively. These mountain ranges were discovered through radar mapping by spacecraft like the Magellan mission. Their formation is thought to be the result of geological processes similar to those on Earth, such as tectonic movements and volcanic activity.