Earth-717 or Earth 717 is a designation used to identify a continuity in which most of early 2006's What If one-shot titles take place in the fictional Marvel Comics Multiverse.
Read more about Earth-717: Origin of Earth-717, What If: Captain America, What If: Daredevil, What If: Fantastic Four, What If: Sub-Mariner, What If: Thor, What If: Wolverine