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Sēo Donua (, of Iraniscum ƿorde *dānu þæt mǣnþ "ēa" oþþe "strēam", on Ealdcrēcisce Ἴστρος Istros) is sēo lengeste ēa in þǣre Europiscan Gesamnung.

Hire fruma is in þǣm Sƿeartƿealde in Þēodisclande, of tƿǣm lytlum ēam: sēo Brigach and sēo Breg.  Hīe mētaþ be Donaueschingen; þēos geānlǣhte ēa is sēo Donua.  Hēo flēƿþ ēast 2850 km (1771 mīla), þurh missenlica Europisca hēafodbyrg, and flēƿþ in þǣm Sƿeartan sǣ þe is æt þǣm Donuamūðan in Rumǣnie and Ucrægnan.

Hēo flēƿþ þurh Þēodiscland, Ēastrīce, Ungerland, Slofacie, Croatie, Serbie, Pulgaraland and Rumǣnie.

Gēogēare ƿǣron see Rīn and sēo Donua norþerna mearca þæs Rōmāniscan Rīces.

Ēa in Europan