The Loudias (Greek: Λουδίας) or Lydias (Λυδίας), popularly called Mavroneri (Μαυρονέρι, "Blackwater", from its Ottoman Turkish name Kara Asmak قره آصماق) is a river in Central Macedonia that flows through the regional units of Pella and Thessaloniki draining into the Thermaic Gulf through the Axios Delta National Park.

[1] In the past water from the Voras, Vermio and Paiko mountains, flowed into Giannitsa Lake and from there flowed to the Thermaic Gulf.

In 1912, during the First Balkan War, this area became the site of the Battle of Giannitsa.

Media related to Loudias at Wikimedia Commons

This article related to a river in Greece is a stub.