|Length||69 km (43 mi)|
|Basin size||462 km2 (178 sq mi)|
|Progression||Sava→ Danube→ Black Sea|
Sunja rises in the mountainous forested areas of Zrinska Gora, south of the village of Lovča. It flows northward until it turns southeast at Komogovina, and then north again near Majur. It turns east at the eponymous village of Sunja and continues through Lonjsko Polje until it merges into the Sava east of Krapje.
It's been suggested that the names "Sava", "Sunja" and "Sutla" are related, but this is uncertain.
- Statistical Yearbook of the Republic of Croatia 2017 (PDF) (in Croatian and English). Zagreb: Croatian Bureau of Statistics. December 2017. p. 47. ISSN 1333-3305. Retrieved 23 May 2018.