There are a number of possibilities but Georgenburg (in German):
Rybitwy is a village in the administrative district of Gmina Pakość, within Inowrocław County, Kuyavian-Pomeranian Voivodeship, in north-central Poland.
seems one of the most likely as Plock and Toruń (Thorn in German) are a couple of the nearest densely populated areas with names that are less challenging to those who are not Polish.
This largely disregards the Belarus reference.
Another possibility is Rybitwy the:
village in the administrative district of Gmina Józefów nad Wisłą, within Opole Lubelskie County, Lublin Voivodeship, in eastern Poland.
which is about 50 miles from another Toruń. Both however are not far from (the much bigger) Lublin and that has a name that also translates easily – but a location a long way from Plock.
PS Rybitwy is Polish for tern.