Question: What is the name of the Valley in which the Lenni-Lenape Nation were living at the time when Philadelphia was established and through which the Delaware River flows?
Sentence (from "Frankford Creek"): The Philadelphia neighborhoods of Olney and Feltonville lie on the western side of the stream in this area while Northwood, Lawncrest, Summerdale, and Frankford lie on the eastern side.
Relevant evidence: No