Mill Creek rises in Montgomery County, Pennsylvania; runs southeasterly to West Philadelphia, where it enters 19th-century sewer pipes; and debouches roughly five miles later in the Schuylkill River near The Woodlands Cemetery. It starts near Narbeth, where its source is buried, then runs free for a mile or so before entering Philadelphia at the Overbrook station. The creek, which drains about 5,000 acres (20 km2), gave its name to a neighborhood in Philadelphia that it flows under.