Strabo Geography 5.1.8

[8] Opitergium, ¹ Concordia, Atria, ² Vicetia, ³ as well as some smaller cities, are less annoyed by the marshes: they communicate by small navigable canals with the sea. They say that Atria was formerly a famous city, from which the Adriatic Gulf, with a slight variation, received its name. Aquileia, which is the nearest to the head [of the gulf], was founded by the Romans, ⁴ to keep in check the barbarians dwelling higher up. You may navigate transport ships to it up the river Natisone for more than sixty stadia. This is the trading city with the nations of Illyrians who dwell round the Danube. Some deal in marine merchandise, and carry in waggons wine in wooden casks and oil, and others exchange slaves, cattle, and hides. Aquileia is without the limits of the Heneti, their country being bounded by a river which flows from the mountains of the Alps, and is navigable for a distance of 1200 stadia, as far as the city of Noreia, ⁵ near to where Cnaeus Carbo was defeated in his attack upon the Kimbrians. ⁶ This place contains fine stations for gold washing and iron-works. At the very head of the Adriatic is the Timavum, ⁷ a temple consecrated to Diomede, worthy of notice. For it contains a harbour and a fine grove, with seven springs of fresh water, which fall into the sea in a broad, deep river. ⁸ Polybius, however, says that, with the exception of one, they are all salt springs, and that it is on this account the place is called by the inhabitants— the source and mother of the sea. Posidonius, on the other hand, tells us that the river Timavo, after flowing from the mountains, precipitates itself into a chasm, and after flowing under ground about 130 stadia, discharges itself into the sea.