|Official name||Lonjsko Polje Nature Park|
|Designated||18 January 1993|
Lonjsko Polje (English: Lonja Field) is the largest protected wetland in both Croatia and the entire Danube basin. It covers an area of 505.6 square kilometres (195.2 sq mi), extending along the river Sava from the areas east of Sisak, the lower course of the river Lonja for which it is named, to the areas west of Nova Gradiška, along the course of the river Veliki Strug.
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