The Danube river (2850 km) flows through the northern third of the country; it is 588 km long and forms the border with Croatia and part of Romania, alongside the Wallachian Plain in the east.
The Sava river forms the southern border of the Vojvodina province, flows into the Danube in central Belgrade, and bypasses the hills of the Fruška Gora in the west.
Dinaric Alps of Serbia follow the flow of the Drina river (at 350 km navigable for smaller vessels only) overlooking the Dinaric peaks on the other side of the shore in Bosnia and Herzegovina.
Over one quarter of Serbia's overall landmass (27%) is covered by forest. Climate The Serbian climate varies between a continental climate in the north, with cold winters, and hot, humid summers with well distributed rainfall patterns, and a more Adriatic climate in the south with hot, dry summers and autumns and relatively cold winters with heavy inland snowfall.
Differences in elevation, proximity to the Adriatic sea and large river basins, as well as the exposure to the winds account for climate differences. Mountain ranges and major rivers of Serbia, including Kosovo Vojvodina possesses typical continental climate, with air masses from Northern and Western Europe which shape its climatic profile.