User blog comment:Jacknapier10/Which characters cannot appear in the Marvel Cinematic Universe?/@comment-5350299-20140429130939/@comment-24901406-20140511163029

Savage land is with Marvel, they own the rights to Ka-Zar which gets the Savage Land as a priority over the X-Men. Atlanits is public domain so can't be owned by anyone. Latveria is definitely with Fox though (mentioned in the Fantastic Four film).