The South County Trailway is a 14.1-mile (22.7 km) long rail trail stretching from the Putnam Trail in Van Cortlandt Park in the Bronx to the North County Trailway in East View, New York. Westchester County Parks constructed the trailway in segments beginning in 1990 and completed it on October 31, 2017.

The Saw Mill River is a 23.5-mile (37.8 km) tributary of the Hudson River in Westchester County, New York, United States. It flows from an unnamed pond north of Chappaqua to Getty Square in Yonkers, where it empties into the Hudson as that river's southernmost tributary. It is the only major stream in southern Westchester County to drain into the Hudson instead of Long Island Sound. It drains an area of 26.5 square miles (69 km2), most of it heavily developed suburbia. For 16 miles (26 km), it flows parallel to the Saw Mill River Parkway, a commuter artery, an association that has been said to give the river an "identity crisis."