Is Celestia above Fontaine Genshin?

Excuse me, could you please clarify something for me? I've been reading about the world of Genshin Impact and I'm a bit confused about the geographical layout. Could you tell me, is Celestia positioned above Fontaine in the game's universe? I'm trying to get a better understanding of the game's cosmology and it would really help if you could confirm this for me. Thank you in advance for your assistance.