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Paratethys
Paratethys was a vast shallow epicontinental sea that covered Eurasia's southern margin from about 33 million years ago into the Pliocene, leaving the Black, Caspian, and Aral seas.
Tethys Ocean
Tethys Ocean (Téthys): ancient ocean between Gondwana and Laurasia, conceived by Suess; successive Paleo-, Meso-, and Neo-Tethys basins, once ~12,000 km wide, closed by the India-Eurasia collision, leaving the Mediterranean and Caspian as remnants.