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Magnesia may refer to:
- Magnesia (regional unit), the southeastern area of Thessaly in central Greece
- Magnesia ad Sipylum, a city of Lydia, now Manisa in Turkey
- Magnesia on the Maeander, an ancient Greek city in Anatolia
- Magnesia Prefecture, a former prefecture of Greece
- Magnesia, a mythical city-state in Plato's Laws
disambiguation page lists articles associated with the title Magnesia.
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