English: Parthian Empire at its greatest extent (geographical). The borders of the green territory of the previous map were stretched to fit the new geographical background in standard cylindrical projection , whereas the previous background was in round projection, very rarely used for partial maps due to its inaccuracy. Therefore the actual borders were not moved (they are exactly the same in respect to locations on the ground), it is just that the map projection is different. Standard cylindrical projection is preferred to show territories in order to avoid distortions.