Earth-11 is the reality where the genders are switched with respect to Earth-0. The Justice Guild fights for good with a line-up where the strongest females (and some males) team up.
Earth-11 was created by Grant Morrison and Ivan Reis
In Superman 349, pre-Crisis Superman travel to another universe Earth created by Mr. Mxyzptlk. Superman meets gender-reversed version of himself named Superwoman and other super-heroes.
Post-Zero Hour / Unknown Earth
In Superboy v4 61, Superboy travels across Hypertime to other alternate reality. In one of this realities Superboy meets gender-reversed version of himself named Supergirl, she joins his team of other Superboy's to stop Black Zero.
Post-Zero Hour / Earth-Reversed Genders
In Superman/Batman v1 22 "With a vengueance", Batman and Superman travel to an dream reality where gender-reverse super-heroes. Batman and Superman helps female versions of themselves, Batwoman and Superwoman to stop Woman Man.
The New 52 / Earth-11
It is said that on this world, the Amazons of Themiscyra never hid themselves from the world, but instead shared their knowledge, influencing the course of its events. Is a matriarchal Earth a better one? Even though it still has its villains and needs its heroines, there seems to be no doubt that this world has seen changes for the betterment of all womankind.
In The Green Lantern, Seasons 1 and 2 it has been seen more of earth 11 and its heroines, specially Star Sapphire. Searching how to defeat the Golden Lantern, Carol Ferris of earth 11 drove her Hal Jordan to earth 0 to distract the Golden Lantern but didn't count with that Earth 0 Carol Ferris was also a Star Sapphire and an analog to her Jordan. The presence of both Jordans and Carols in earth 11 attracted the attention of the Golden Lantern who destroyed earth 11 moon. Only with the help of the prime Green Lantern, the satellite was saved.