Knob Mountain is a ridge in the northeastern part of Columbia County, Pennsylvania and parts of Luzerne County, Pennsylvania. Its elevation is over 1720 feet above sea level. Knob Mountain can be seen from a considerable distance, and is also visible from Bloomsburg. The peak of the mountain is one of the highest points in Columbia County.

Columbia County is a county in the Commonwealth of Pennsylvania. It is located in Northeastern Pennsylvania. As of the 2020 census, the population was 64,727. Its county seat is Bloomsburg. The county was created on March 22, 1813, from part of Northumberland County. It was named Columbia, alluding to the United States and Christopher Columbus. The county is part of the Central Pennsylvania region of the state.