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Yugoslavia Drainage Systems
The Pannonian Plains are drained by the Danube and its four
major tributaries, the Drava, Tisa (Hungarian spelling Tisza),
Sava, and Morava. The Danube, extremely wide and deep at some
points, varies greatly between high- and low-water seasons. The
former is from March or April until May or June, the latter from
mid-July to late October. The Danube also drains the interior
highlands. The Vardar River and its tributaries drain the
southeastern region into the Aegean Sea, and the Neretva drains
the region into the Adriatic. The western alpine slopes parallel
to the coast are drained into the Adriatic by surface and
underground streams. Underground streams are formed when water
seeps through the limestone of the alps into channels, then
empties into the Adriatic below its surface.
Data as of December 1990
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