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 89 kilometres (55 mi) long and has a watershed area of 584 square kilometres (225 sq mi).[2]

Sotla / Sutla
Sutla River in Zelenjak, between Klanjec and Kumrovec
CountrySlovenia, Croatia
Physical characteristics
  elevation580 m (1,900 ft) [1]
45°51′52″N 15°41′01″E
135 m (443 ft) [1]
Length88.6 km (55.1 mi) [2]
Basin size584.3 km2 (225.6 sq mi) [2]
Basin features
ProgressionSavaDanubeBlack Sea


The Sutla flows through the following municipalities:

The hydrological parameters of the Sutla are regularly monitored in Croatia at Zelenjak.[3]

The division of the Sutla/Sotla basin area between Croatia and Slovenia is inconsistent in sources; Croatian sources claim either 343 km2 (132 sq mi)[4] or 455 km2 (176 sq mi),[5] while Slovenian sources claim either 477 km2 (184 sq mi)[6] or 451 km2 (174 sq mi).[1]

The Kozje Park (Slovene: Kozjanski park), established in 1981 as the Trebče Memorial Park (Spominski park Trebče), is located in the Slovenian territory to the west of the Sotla. It covers 206 km2 (80 sq mi) of the landscape of Kozje Hills (Kozjansko hribovje), including wetlands along the Sotla. It is the habitat of over 120 bird species and of about 950 higher plant species.[7]

The earliest known mention of Sutla was in 1028, as Zontla.[8] It has been suggested that the names Sutla and Sava are related, but this is uncertain. Another theory is that the name Sutla comes from the Indo-European root *su, meaning 'swine'.


  1. Rivers, longer than 25 km, and their catchment areas, Statistical Office of the Republic of Slovenia
  2. "Sava River Basin Analysis Report" (PDF, 9.98 MB). International Sava River Basin Commission. September 2009. p. 13. Retrieved 2018-05-18.
  3. "Daily hydrological report". Croatian Meteorological and Hydrological Service. Retrieved 2010-09-09.
  4. Ostroški, Ljiljana, ed. (December 2015). Statistički ljetopis Republike Hrvatske 2015 [Statistical Yearbook of the Republic of Croatia 2015] (PDF). Statistical Yearbook of the Republic of Croatia (in Croatian and English). 47. Zagreb: Croatian Bureau of Statistics. p. 49. ISSN 1333-3305. Retrieved 27 December 2015.
  5. "Karakteristike značajnijih vodotoka". Vodnogospodarska osnova Hrvatske - Strategija upravljanja vodama (in Croatian). Croatian Parliament. Retrieved 2011-12-19.
  6. Visokovodni valovi – Sotla nad Draganjo in Draganja na izlivu (delovna verzija). Elaborat, Vodnogospodarski inštitut. Ljubljani, 2000.
  7. Bizjak, Janez (2008). Zavarovana območja v Sloveniji [Protected Areas of Slovenia] (PDF) (in Slovenian and English). Ministry of the Environment and Spatial Planning, Republic of Slovenia. ISBN 978-961-6392-61-7.
  8. Šimunović, Petar (March 2013). "Predantički toponimi u današnjoj (i povijesnoj) Hrvatskoj" [Pre-Roman placenames in present-day (and historical) Croatia] (PDF). Folia onomastica Croatica (in Croatian). Zagreb: Croatian Academy of Sciences and Arts (22): 209. Retrieved 18 January 2016.
  • Media related to Sutla at Wikimedia Commons
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