The Pontic shad, also referred to as the Black Sea shad or Kerch shad, is a species of clupeid fish in the genus Alosa, native to the Black Sea and Sea of Azov basins.
The Rezovo is a river in the extreme southeast of Bulgaria and northernmost part of European Turkey. Its length is 112 km, of which the uppermost 23 km are in Turkey and 89 km form the Bulgaria–Turkey
The Bulgarian–Turkish border at the Rezovo River mouth