The river Isar is a tributary to the Danube flowing in Tyrol, [Austria] and Bavaria, 295 km in length from the Karwendel range of the Alps down to Deggendorf.
On its way from the mountains to the Donau it passes along Garching (and of course through Munich) so it is what most qualifies as "our river".
The Isar in a torrential and muddy mood, sometime in the summer 2011 in the area between Garching and Munich.
The name possibly stems from the Celtic words ys (fast, torrential) and ura (water, river).
ys may also mean "high" as well as "low" 
Julia in clearer waters, near the Heckerbrücke on 31 July (2022).
Relaxing on the beach (id.).