Joanna starts her adventure in Germany's Black Forest where the mighty Danube is just a trickle. At the source of the river, Joanna admires the statue of Danuvius, an ancient Roman river god, who is keeping guard.

In Slovakia, Joanna traces Danube tributaries up to the top of the snow-capped Tatras. In Budapest she explores the river by boat and rides a unique children's railway, as well as discovering the city's Jewish heritage.

Joanna heads towards the Danube Delta, one of the last great wilderness areas remaining in Europe. At the mouth of the river, on Romania's Black Sea coast, she bids farewell to the Danube and reflects on her amazing journey.