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There should be "Lithuania" - sorry for the typo! Can someone correct this please?
Here is a map I found of the Suwalki region. I marked the former Polish and Prussian border with green:
I have seen this map in several variants. It shows the furtherst Lithunian extent of Lithuanian-speaking area. I think it shows the situation in 1876, but in one source it stated 1863.
Here is the map of current borders - the line from Lipsk upwards should be tilted slightly to the West rather than vertical - but since those are manily forest areas (Puszcza Augustowska) it wont make a big difference:
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