Danube
Danube
The Danube rises in Germany but becomes navigable at Kelheim where the Main Danube canal joins it. Leaving Regensburg and Passau, the Danube flows eastward into Austria past Linz, and through the Wachau Valley and Melk Abbey and the beautiful riveside villages of Krems and Durnstein. before reaching Vienna.
Middle Danube
Leaving Vienna the river flows through the Hungarian Gates Gorge into Slovakia and Bratislava before it slows and enters the Visegrád Gorge crowned with fortresses, castles, and cathedrals to reach Esztergom and Budapest. After Budapest the Danube crosses the Great Alfold plain until it reaches the Iron Gate gorge forming the Serbian/Croatian border.
Lower Danube
Beyond the Iron Gate the lower Danube flows eastwards across a wide plain past Belgrade. Further on the river runs between the steep banks of the Danubian Plain of Bulgaria and the lakes and swamps bordering low Romanian Plain. After passing Bucharest the Danube enters the Black Sea as a wide delta- a network of channels, brooks and ponds. Here you will find floating islets covered by rush and reed, rainforest-like lianas, lakes with muddy depths and surfaces carpeted by water lilies. There are countless pelicans and flocks of cormorants and moor hens.
The climate along the Danube River is temperate and unpredictable. From May to October (the main season), the average high temperatures increase as you travel east along the river and range from 65 to 79°F (19 to 26°C) and the average low temperatures range from 48 to 59°F (9 to 15°C).
The most popular times are aerly and late season when it is not as hot. Around Christmas, temperatures close to 32°F (0°C) can be expected.