In Spider-Man: Far From Home,
Mysterio (Quentin Beck) explains that he's from Earth-833, while the main setting of the MCU is Earth-616.
Now, of course,
It turned out to have been a fabrication.
But that planet is still holographically depicted and it appears to have
large swathes of the continents (in particular South America and Australia) either missing or underwater.
From a story-telling perspective, it needed to appear noticeably different to the audience. But why did the creators of that hologram design it that way (in their justification)? It is because:
- The planet is just different than ours?
- It was caused by the Elementals?
- That world had rampart climate change leading to higher sea levels?