Judging by the map of Ooo, there appears to be a large skull with a sword driven through the top of its head. This could either be the icon of the Bad Lands and its inhabitants (if it really has any), or a literal skull located within the area. It is unknown how large the skull is, due to the disproportionate scaling on the map. It must be large, magical, or possibly a myth or else it would not have been seen on the map. In fact, this skull might not be real at all; it may just be a good image to match the name "Bad Lands."