Erythropotamos

Erythropotamos
Luda reka (Луда река)
Origin Eastern Rhodope Mountains
Mouth Maritsa/Evros
Basin countries Bulgaria, Greece
Length approx. 100 km

The Erythropotamos (Greek: Ερυθροπόταμος, meaning "red river"), Luda reka in Bulgaria (Bulgarian: Луда река, meaning "mad river") is a river in southern Bulgaria (Haskovo Province) and northeastern Greece (Evros regional unit). Its Turkish name was Küzüldeli Su. Its source is near Mega Dereio. It flows into the Maritsa (Evros River) near Didymoteicho.

The river begins in Greece in the western Evros regional unit, it passes through Mega Dereio and the Ivaylovgrad municipality in Bulgaria, through the villages of Gorno Lukovo and Dolno Lukovo (Upper and Lower Lukovo) and Siv Kladenets with a tributary known as the Byala reka ("white river"). The river reenters Greece and flows north of Protoklissi, the nearby villages include Paliouri and Sitochori.