Gilson Run is a 2.10 mi (3.38 km) long tributary to Pine Creek in Warren County and Forest Counties, Pennsylvania.

Gilson Run rises about 0.5 miles northeast of Pineville, Pennsylvania in Forest County and then flows northwest into Warren County to Pine Creek about 3 miles southwest of McGraw Corners, Pennsylvania.

[2] Gilson Run drains 7.98 square miles (20.7 km2) of area, receives about 44.9 in/year of precipitation, and has a wetness index of 439.04 and is about 93% forested.

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