The river Havel in the north east of Germany is an extraordinary river in many aspects. It meanders along 334 kilometres across numerous natural lakes and a mostly almost uninhabited area. The contrasts become greater, when the river touches big cities such as Berlin or Potsdam. This expedition along the river Havel, from its source to its estuary, shows amazing natural spectacles, filmed with extensive techniques. From fighting sea eagles to young beavers in a castle and a hoopoe who is breeding in the probably safest nest of the world: in a disused panzer.