Res Gestae

But the river Danube, rising near Augst,[*](According to Pliny, N.H. iv. 79, the Danube rises in Germania iugus montis Abnobae ex adverso Rauraci Galliae oppidi. For the seven months, cf. Val. Flacc. viii. 186, septem exit aquis, septem ostia pandit. ) and the mountains near the Raetian frontier, extends over a wide tract, and after receiving sixty tributaries, nearly all of which are navigable, breaks through this Scythian shore into the sea through seven mouths.[*](The earlier writers counted only five; Pliny and Ptolemy, six; Strabo, seven.)