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In page History of Austria:

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In the south of modern Austria, Slavs had settled in the valleys of the Drava, Mura and Save by 600. The westward Slavic migration stopped further Bavarian migration eastwards by 610.[citation needed] Their most westward expansion was reached in 650 at the Puster Valley, but gradually fell back to the Enns by 780.[1] The settlement boundary between Slavs and Bavarians roughly corresponds to a line from Freistadt through Linz, Salzburg (Lungau), to East Tyrol (Lesachtal), with Avars and Slavs occupying eastern Austria and modern Bohemia.