Slavonia (Slavonija in Croatian) is the northeastern region of Croatia, bordering Hungary, Serbia, and Bosnia and Herzegovina. (It should not be confused with the nearby country of Slovenia.)
- The Kopački Rit  is the biggest natural wetlands in Europe and the birdlife is spectacular. This enormous nature park, located around 15km north of Osijek where the Danube and Drava rivers flow into one another, is a great day out in the countryside - though bring some insect repellent as the mosquitos do bite!! There is no public transport to the park, so take the local bus to Bilje and its a 2-3km walk.
- The Jasenovac Memorial Site , which keeps the memories of one of the darkest moments in modern Croatian history: the existence of the Jasenovac concentration camp, dating from World War II. From Zagreb to Jasenovac it's a three-four hours train ride, and a 7 hours one from Belgrade; visitors arriving at the Jasenovac village's train station have a ten-minute walk east to the Memorial Site. Entry is mostly free, though guided tours in English and Croatian cost HRK 200.
- Stay in Osijek, the principal city of Slavonia and visit all the sights and cities around.