Rivers of Stara Zagora Province

The Tundzha ( ; ; Tonsus in antiquity) is a river in southeastern Bulgaria and northwesternmost Turkey, a left tributary of the Maritsa. With a length of 390 km, of which 350 km are in Bulgaria, it is Maritsa's longest tributary, though in terms of discharge it is second after the Arda. Tundzha Glacier on Livingston Island in the South Shetland Islands, Antarctica is named after Tundzha River.

The Sazliyka or Rakitnitsa (, ; also transliterated Sazlijka or Sazliika) is a river in southeastern Bulgaria, a left tributary of the Maritsa. It originates in the Sarnena Sredna Gora mountain range. In its upper course until Radnevo, it is also known as the Rakitnitsa or Syuyutliyka. The river is 145 kilometres in length and is the fifth longest in the Maritsa drainage, following the Tundzha (390 km), the Arda (290 km), the Ergene (281 km) and the Topolnitsa (155 km).

river in Bulgaria