>>212531122
Red Sonja has a weird origin in that she is a creation of Roy Thomas for the Marvel Conan Comics, but she is based on a REH character called Red Sonya from the story The Shadow of the Vulture, which was set in the 16th century in Hungary.
Since Red Sonja is different from Red Sonya, she got split off from the rest of the REH estate and Conan IP into her own series at some point when they made a film in the 80s, which is why Schwarzenegger shows up in that film.
Sonja herself is set in the same setting as Conan, so the Hyborian Age, but instead of being from Cimmeria like Conan is from she's from Hyrkania.
her main villain is the Empire of Turan, a sort of Persia expy
pic unrelated i didn't have a small enough version of the Hyborian map to upload

>>211540478
China
Sometimes Japan, depending on whether the Shogun wrote the story