Grown around a flooded destroyed city, the crimson mangrove was named "the land where God didn't finish creation" by Admiral Byrd in the early 1940s. The amount of iron within the subterranean soil causes the plant life to be a bright crimson color. Though this is now seen as only one biome within Agartha, the flora and fauna are unique to the area nonetheless. The plants in the crimson mangrove are extremely brittle and sharp,comparable to volcanic glass. The fauna In the crimson mangrove are extremely large, size comparable to how they were during the Permian era. Organisms like megalopithicus Kong, a giant ape with intelligence comparable to that of a neanderthal, battle for dominance against things such as Gorosaurus, cryptosochus cranium reptant, and gigamantodea kamacura. The plants seem to all have connections to an organism named Biollante, as the DNA matches that of the giant creature. The water is safe to drink and as far as has been documented, no evidence of civilization is present.
You're just not a proper son of godzilla if a full grown kaiju doesn't wanna beat your child ass for some reason.
EDIT:
I thought about including Gabara, but that would be too many on Minilla's side. Though it does really just cement that everyone had it out for this poor kid.