Wallis Run is a 9.8-mile-long (15.8 km) tributary of Loyalsock Creek in Lycoming County, Pennsylvania, in the United States. [1] It gives its name to the community of Wallis Run, located along the stream where it turns from southward to westward.
41°21′15″N 76°54′44″W / 41.35413°N 76.91226°W