The Isar river begins its way to the Danube and the Black Sea high in the Hinterau valley in the Austrian Tyrol.
Surrounded by the Karwendel mountain the source of the Isar is produced from many natural springs which bubble all year round.
The nearest village to the source is Scharnitz, near the border with Germany and part of the plateau which surrounds the better-known holiday destination of Seefeld in Tirol.
The tour on two wheels from Scharnitz is a popular one with the journey to the source of the Isar around 14 kilometres in distance.
At the source, display boards provide information about this natural treasure on a trail through the different springs.
The upper Isar is also a popular route for canoeists and kayakers.
More information: www.seefeld.com