For articles relating to the acronym of the same spelling, see
ISAR. The Isar is the fifth largest
river in
Bavaria,
Germany, right tributary of the Danube. After the
Inn river and the
Lech river, it is the third most important tributary of the
Danube river in
Germany and is 295 km in length. The name Isar appears to be derived from the
Celtic word Isaria (meaning torrential).
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