Lake Xynias or Xyniada (Greek, Modern (1453-);: Λίμνη Ξυνιάς/Ξυνιάδα) was a lake in Central Greece.
The lake lay in a caldera of Mount Othrys, and measured approximately 5 km × 7 km, with a depth of 5 m.[1] It was named after the nearby city of Xyniae.[1] In the Middle Ages, it received the Slavic name Ezeros, after which the city was also renamed.
The lake was drained in 1936–42 to create arable farmland.