What is "sutla"

The Sutla ( Croatian) or Sotla ( Slovene) is a river flowing through Slovenia and Croatia, mostly forming their border. It is a tributary to the Sava, itself a tributary to the Danube. It is long and has a watershed area of .

The Sutla flows through the following municipalities:

• in Slovenia: Rogatec, Rogaška Slatina, Podčetrtek, Bistrica ob Sotli, Brežice
• in Croatia: Đurmanec, Hum na Sutli, Desinić, Zagorska Sela, Klanjec, Kraljevec na Sutli, Brdovec

The hydrological parameters of the Sutla are regularly monitored in Croatia at Zelenjak.

The division of the Sutla/Sotla basin area between Croatia and Slovenia is inconsistent in sources - Croatian sources claim either or , while Slovenian sources claim either or

The Kozje Park (Slovene: ), established in 1981 as the Trebče Memorial Park , is located in the Slovenian territory to the west of the Sotla. It covers of the landscape of Kozje Hills , including wetlands along the Sotla. It is the habitat of over 120 bird species and of about 950 higher plant species.