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 "Tamanend"): Tamanend or Tammany or Tammamend, the ""affable"", (c. 1625–c. 1701) was a chief of one of the clans that made up the Lenni-Lenape nation in the Delaware Valley at the time Philadelphia was established.
Relevant evidence: Yes