Where the Lycus Sulci landslide masses border the Amazonis Planitia lowlands to the northwest of the Olympus Mons volcano, an 8.2-kilometre-diameter crater called Yelwa can be seen. It is named after a historic city in Nigeria. From there, it is more than a thousand kilometres to the summit of the Olympus Mons, roughly the distance from the southernmost to the northernmost points in Germany. The Olympus Mons shield volcano, which is 21.9 kilometres high, has a base diameter of 600 kilometres. The Lycus Sulci material was pushed hundreds of kilometres from the base of the volcano into the surrounding landscape as a result of landslides.