North Knob, also known as Elk Hill, is a mountain peak in Herrick Township, Susquehanna County, Pennsylvania. North Knob is the highest peak in eastern Pennsylvania, east of the Susquehanna River. It is the highest peak on the Allegheny Plateau. North Knob, also known as Elk Mountain, rises conspicuously above the surrounding landscape. The mountain actually has two peaks, the main summit of North Knob, and the lower summit known as South Knob 2,602 feet (793 m).