Koules, Castello del Molo, Rocca a Mare, Castello a Mare, Castel di Candia or the former Castel di Candia is the Venetian fortress built by the Venetians at Heraklion. It is located at the entrance of the Venetian harbor in order to protect the port of Heraklion and the Castle of Paleokastro the bay of Ammoudara from invasions and landings of other conquerors.