Earth-7 was one of the many universes in the Original Multiverse. It was destroyed during the Crisis.
At some point, Jay Garrick detected Antimatter near Earth-7 and marked them on a map.
He later showed this map to Barry Allen.
On December 10, 2019, like other universes in the Multiverse, Earth-7 was destroyed during the Crisis.
|A Flash of the Lightning||Map|