The entire terrestrial world or lands of both hemispheres, an archaic geographical term.
From Greek 'amphi-' (both) and 'gaia' (earth). A classical term used by early geographers and explorers to refer to the whole known world.
When explorers discovered the Americas, Europeans used terms like amphigaea to emphasize that now they knew about lands on both sides of the Earth—it's like how ancient Greeks used 'amphi' to express amazement at discovering the world was bigger than they thought.
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