1) International river of Europe 
The Erythropotamos (Ερυθροπόταμος, meaning `red river`) or Luda reka (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) near Didymoteicho. Th...