The silver hoard was found near Truso on the Vistula estuary.
en.wikipedia.org/wiki/Truso
In the 9th century, the merchant Wulfstan of Hedeby travelled to Truso in the service of the English King Alfred the Great and wrote his account of the place at a prominent location of the Amber Road, which attracted merchants from central and southern Europe, who supplied the markets in the Mediterranean and the Middle East with the highly valued commodity...
... Truso was situated in a central location upon the Eastern European trade routes, which led from Birka in Sweden via Visby on the island of Gotland towards the southern Baltic Sea shore, where in the 13th-century the Hanseatic city of Elbing was established. From there, trade continued further south along the Amber Road to Carnuntum in the Alps. These ancient roads led further south-west and south-east to the Black Sea and eventually to North Africa and the Middle East.[3] Gimbutas has observed that
<span class="italic">'For Old Prussia, Truso played the same central role as Haithabu for north-western Germany or the Slavic Vineta for Pomerania'.[2]</span>
East–western trade routes lead from Truso and Wiskiauten (a rival trading centre in Old Prussia, at the south-western corner of the Courish Lagoon), along the Baltic Sea to Jutland and from there up the Slien inlet to Haithabu (Hedeby), the large trading center in Jutland. This town, located close to the modern city of Schleswig in Schleswig-Holstein, was centrally located and could be reached from all four directions over land as well as from the North Sea and the Baltic Sea.[1][4]
en.wikipedia.org/wiki/Truso#/media/File:Amber_Road.jpg