So I was still a little confused about the location of this whole event but I finally figured it out.
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Earth is Earth (1)
Krakoa is on Earth (3) but can access Otherworld through The Avalon and External Gates
Otherworld is in another plane of existence , Besides Krakoa, England is the only other way to get there
Otherworld is the magical subconscious of The British Isles
Amenth is like Earth , Its own place but it has fallen (2)
Arrakko lies on the opposite side of Krakoa between Otherworld and Amenth like Krakoa , Arrako can access Otherworld (4)
Annihilation and Deamons are from Amenth and they invaded Arrako which was similar to Krakoa.
Annihilation took over Arrakko and The First Horseman then they invaded Otherworld to get to Krakoa which is where our story starts off.