>Two geographic locations are magically merged into one How

That depends on how you do it.

>>46519805
Most people and animals would die instantly, and most buildings and the landscape would be effectively destroyed.
It'd make more sense if it was from another dimension/plane of existence rather than another location of the same world.
While devastating to the locals, scavengers of all kinds would profit from the event. Not only would there be dead things all over the place, but suddenly all sorts of alien resources would be available. The neighbors would probably all go to war in order to harvest the merged area, which would now contain many materials that were impossible to get before.

what ever you want. Forgotten Realms has done it.
the TV show Fringe explored the concept quite a bit.

>>46519805
Liberia merges with California?

>>46520132
I'm cool with it as long as it's over Los Angeles. Fuck that hell hole.

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>>46519805
Atomic fusion.

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>>46519805
Anything could happen. But if it's in Vor the Maelstrom, expect the worst.

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>>46520154
BOMBE ATOMIQUE
SUR L'AFRIQUE

>>46519805
In the anime "Cross Ange" the BBEG tries to merge two worlds on different dimensions into one. This causes people to get stuck in masonry and die.

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>>46521038
Now why does that sound familiar?...

>>46522770
What does teleporting a ship have to do with merging worlds? (Interesting story btw didn't know that)

>>46522874
Allegedly, a lot of sailors got stuck in the hull and bulkheads of the ship and died.

the Rathi overlay kind of does that, in magic the gathering

Magic flowstone artificially enlarged the plane of rath until it overlapped with dominaria, merging the two together (alongside a phyrexian invasion force). Lots of weird mutations came from it, including fading/shadow, and various hybrids/abominations like the goblin merfolk.

It was pretty funky.