Earth-1

Earth-1 is one of the many Earths in the multiverse of the Flashverse continuity. It is the main Earth, where the majority of the Flashverse franchises take place, such as The Flash and The Batman.

History
The first known contact between Earth-1 and another Earth in the multiverse, was when The Flash trapped Gorilla Grodd on Earth-2.

The Black Flash would later travel to Earth-1 to fight The Flash.