Its territory stretched north to the New York state line , west to the Allegheny River , south nearly to the source of the West Branch Susquehanna River .
Its territory east to include modern Sullivan County and a bit beyond .
Its territory stretched north to the New York state line , west to the Allegheny River , south nearly to the source of the West Branch Susquehanna River , and east to include modern Sullivan County and a bit beyond .