Shackamaxon, also known as Penn Treaty Park, is an ancestral territory of the Lenni-Lenape Peoples.

It is known as a significant place because it is where the Great Elm Tree of Shackamaxon once stood. It is where many sachems of the Lenni-Lenape and other tribes from the Lenapehoking territory would meet for council.

In addition, it is where TAMANEND (aka Tammany) the legendary Lenape leader signed the 1682 Treaty of Shakamaxon with William Penn.