Manga with Center of Earth World theme?

[Esmee]

There is one anime movie which has the theme of world in the center of the earth. But the thing is that there are not many manga that covers this theme. So it is hard to find good art in that context. 

Do you know any good manga with the center of the earth theme?

 

[Burnsy]

Made in Abyss. Literally the perfect fit and one of the best animes I've ever seen.

 

[Blackangel]

center of world?
that's so vague lol and i am not sure if there is any anime like that.