In the article the toponymic material gathered by the author in the field research was given. The data concerns the 'Zamczysko' entry that was missing in the published in 1992 'Dictionary of toponymy of North-Eastern Poland' by Nina Barszczewska, Jadwiga Gluszkowska, Teresa Jasinska and Elzbieta Smulkowa. In the author's opinion the name 'Zamczysko' is of significant importance in the research of the Suwalki region's past.
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