This route follows the Isar relentlessly from its source in the Karwendel to its confluence with the Danube, drawing a clean, uncompromising line across Bavaria. Stay as close to the river as possible - no shortcuts, no deviations.

The start in the Karwendel is raw and demanding. Gravel, uneven footing, and early elevation gain set the tone. With every kilometer, the character of the Isar changes - from alpine origin to a faster, more flowing river through the foothills and eventually the wide Bavarian plains.