Tethys Sea was an ocean which existed about 250 million years ago during the Mesozoic Era. The Tethys sea is also known as Tethys Ocean or Neotethys. Tethys sea was present between the Laurasia and Gondwana continents when there was no Indian or Atlantic oceans. It was the sea that divided the one large piece of land called “Pangaea” into two super large continents known as Laurasia and Gondwana.