Where was the city of atlantis before it sunk?

The actual location of the fictional place has never been accurately determined. There are a number of theories as to the location - ranging from off the coast of america - to the Mediterranean Sea.

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Many people believe that the historical basis for the Atlantis myth was the Minoan Civilization on the island of Thera in the Mediterranean (now called Santorini).
The Minoan eruption is a key marker for the Bronze Age chronology of the Eastern Mediterranean world.
The Island exploded in a huge volcanic eruption that destroyed the Minoan civilization across the whole Mediterranean somewhere between 1627 BCE and 1600 BCE.