NAUPORTUS, or NAUPORTUM, in Ancient Geography, a town on a cognominal river, towards its source, in Pannonia Superior. The reason of the name, according to Pliny, is, that the ship Argo, after coming up the Danube, the Save, and the Laubach, was thence carried on men's shoulders over the Alps into the Adriatic. The river Nauportus rises in the Alps, near Longaticum, at the distance of six miles from the town. Nauportum; which was a colony of the Taurisci, a people on the confines of Noricum. Now Upper Laubach in Carinthia, on the river Laubach. E. Long. 14. 40. N. Lat. 46. 28.