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Ocean of Planes

Existing slightly to the left of the Nigh Material Plane is the Ocean of Planes, which isn't quite a plane on it's own, but rather a "filler" space between the other planes sandwiched in like the mayonnaise on a triple-decker sandwich. It is a sea of some purple substance in which the other planes float like breakfast cereal in the veritable milk of creation.

It also acts as some sort of Afterlife for Planes themselves, which is even more confusing than it sounds.