Shikellamy State Park is a 132acre Pennsylvania state park located at the confluence of the West Branch Susquehanna River and Susquehanna River in Pennsylvania in the United States. The park is divided into two sections. The older part, on a bluff on the western bank of the river, is the 78acre Shikellamy overlook in Union Township, Union County. The newer part is the 54acre marina on the southern end of Packer Island in Upper Augusta Township, Northumberland County. Packer's Island lies between the city of Sunbury and the borough of Northumberland at the confluence of the two branches of the river.HistoryShikellamy State Park is named in honor of Shikellamy, an Iroquois chief. Chief Shikellamy played a major role in the history of the frontier in Pennsylvania. He was a friend of the Native Americans and the American Colonists of the 18th century. Shikellamy's village was located near where the overlook section of the park is today.