Antirhodos (sometimes Antirrhodos or Anti Rhodes) was an island in the eastern harbor of Alexandria, Egypt, on which a Ptolemaic Egyptian palace was sited. The island was occupied until the reigns of Septimius Severus and Caracalla and it probably sank in the 4th century, when it succumbed to earthquakes and a tsunami following an earthquake in the eastern Mediterranean near Crete in the year 365. The site now lies underwater, near the seafront of modern Alexandria, at a depth of approximately .