Helike (; , pronounced , modern ) was an ancient Greek city that was submerged by a
tsunami in the winter of 373 BC. It was located in
Achaea, northern
Peloponnesos, two kilometres (12
stadia) from the
Corinthian Gulf and near the city of
Boura, which, like Helike, was a member of the
Achaean League. Modern research attributes the catastrophe to an earthquake and accompanying tsunami which destroyed and submerged the city. In an effort to protect the site from destruction, the
World Monuments Fund included Helike in its 2004 and 2006
List of 100 Most Endangered Sites.