The Spačva basin (Serbo-Croatian: Spačvanski bazen, Спачвански базен) is a geographic microregion in eastern Croatia and northwest Serbia.

[2][3][4] Up until the 1935 regulation of the bank of the Sava River the entire region was regularly flooded in spring.

[1] In addition, the region forms an organic continuum with the Bosut Forest (Bosutska šuma, Serbian Cyrillic: Босутска шума) in Vojvodina in Serbia.

[6] Wood industry based in Spačva basin is an important natural resource in the economic output of Vukovar-Syrmia County.

The industrial exploitation of the forest was initiated in the 19th century at the time of Slavonian Military Frontier.