The Isarradweg starts at the Germany-Austria border by Scharnitz, continues past Mittenwald, curves around the Karwendel mountains, and finally runs through a romantic valley on a toll road (but free for cyclists) to Lake Sylvenstein (partially on a main road that has a low volume of traffic). Once past Lenggries, the route leads out of the Alps along a mountain river and through the charming alpine foothills of Upper Bavaria, along the famous nature reserve Pupplinger Au, into the State Capital Munich and then out on serene river meadow paths. After crossing beautiful alluvial forests, it links up with the Donauradweg by Niederalteich. On balance, the cycle route runs south of Wolfratshausen on low traffic roads in hilly terrain, otherwise mainly near the river and away from roads on well-negotiable paths. You can expect a largely family-friendly cycling experience with a contrast between quiet nature and lively and historic Isar towns.
Course outside of BavariaFrom Lenggries/Fall: Via Bavarica Tyrolensis (Austria)
Distance: 61 km
Elevation change: 575 m
The Bavarica Tyrolensis Route branches from the Isarradweg at Lake Sylvenstein and runs along Lake Achen until Wiesing, where it meets the Innradweg. Traversing wild and romantic landscape and nature reserves, the route's surface is asphalt with a water resistant coating. From Achenkirch, the route consists of a few light climbs and long stretches of flat cycle-only roads. Starting in Maurach, the surface alternates between asphalt and gravel as well as using a moderately steep forest path. From Eben to Wiesing, where it meets up with the Innradweg, the route plummets 400 meters. For those that want to relax along this section, there is an option to hop on the Achensee train at Seespitz by Maurach.From Scharnitz: Isarradweg (Austria)
Distance: 28 km
Elevation change: 300 m
The cycle route starts in the border town of Scharnitz on Hinterautal street, following the signs for "Karwendeltäler". It continues along the Isar River until a fork, where the surface is no longer asphalt, instead proceeding on a dirt forest path straight ahead towards the source of the Isar River. The same path returns to Scharnitz.