The gross domestic product (GDP) of the five counties in Slavonia combined (in year 2008) amounted to 6,454 million euro, or 8,005 euro per capita—27.5% below Croatia's national average. The GDP of the five counties represented 13.6% of Croatia's GDP. Several Pan-European transport corridors run through Slavonia: corridor Vc as the A5 motorway, corridor X as the A3 motorway and a double-track railway spanning Slavonia from west to east, and corridor VII—the Danube River waterway. The waterway is accessed through the Port of Vukovar, the largest Croatian river port, situated on the Danube itself, and the Port of Osijek on the Drava River, away from confluence of the rivers.