Pliny the Elder, in describing the southern shore of the Baltic Sea (77–79 AD), mentions “famous” rivers falling into the Ocean (Baltic Sea): Guthalus, Visculus sive Vistla, Albis, Visurgis, Amisis, Rhenus, Mosa (Naturalis historia, IV.100). All of them, with the exception of Guthalus, have been identified. In this paper, an attempt is made to identify this river with the help of archeological data. Guthalus is the only known river in the Baltic basin east of the Vistula. The name Guthalus reflects the ethnonym of the Goths and is probably the eastern border of the settlement is ready. We can compare the river Pliny with a map of Gothic antiquities of Roman times. The archaeological culture of Wielbark is considered German, and even specifically Gotho - Gepidic. The territory of Wielbark culture includes all the Lower Vistula, on both banks of the river. In the region of interest to us, east of the Vistula, where the Guthalus is located, the sites of the Wielbark culture between the Vistula and Pasłęka / Passarge. Therefore, Guthalus can be identified as Pasłęka / Passarge. It marks the eastern boundary of the Gothic settlement in the southern Baltic region.