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Natural portals would be like the Nasa article describes (below). They're totally random and can be explained with basic science.
How do fairy or ancient portals fit in here?
Dimensional portals can be natural or made but are completely theoretical.
Eistein/Rosen bridge (wormhole)
Made portals combine the first two (natural/Dimensional) and are intelligently controlled/created
Theoretical portals are those that have not been observed, but emerge from current mathematical or physical theories.