Buffalo Run is a 3.89 mi (6.26 km) long 3rd order tributary to Sewickley Creek in Westmoreland County, Pennsylvania.

Buffalo Run rises at West Bethany, Pennsylvania,[2] and then flows north-northwest to join Sewickley Creek at Hunker.

[3] Buffalo Run drains 10.12 square miles (26.2 km2) of area, receives about 41.5 in/year of precipitation, has a wetness index of 369.10, and is about 48% forested.

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