Ostrvo or Ostrovo (meaning "island" in Serbian) was the largest Serbian river island on the Danube, with an area of 60 km² (23 sq mi). It was 20 kilometres (12 mi) in length and 3 kilometres (1.9 mi) in width. Today it is no longer an island but peninsula, which is connected to the southern bank of the Danube. Ostrvo lies east of Belgrade, near Kostolac, and is heavily forested.