The County of Chester to begin at ye Mouth or Entrance of Bough Creek, upon Delaware River, being the Upper end of Tenecum Island, and soe up that Creek, deviding the said Island from ye Land of Andros Boone & company ; from thence along the several courses thereof to a Large Creeke Called Mill Creek ; from thence up the several courses of the said creek to a W: S: W: Line, which Line devided the Liberty Lands of Philadelphia from Severall Tracts of Land belonging to the Welsh & other Inhabitance ; and from thence E: N: E: by a line of Marked Trees, 120 perches more or less ; from thence N: N: W: by the Harford Township 1000 perches more or less : from thence E: N: E: by ye Land belonging to Jno: Humphreis.