The West Virginia. Cyclopedia
Valley created by the northward flowing Monongahela River in north-central West Virginia and southwestern Pennsylvania. In its most limited sense, the valley in West Virginia includes the reaches of level lands along the river and its major tributaries in Marion, Harrison, and Monongalia counties. In its larger sense, the valley region may also include relatively low lying areas along the Monongahela River's larger tributaries west of the Allegheny Mountains, including its West Fork, and Cheat and Tygart river tributaries in Lewis, Preston, Taylor, Barbour, and Upshur counties. Three of the largest cities in West Virginia are located along the Monongahela River in the valley: Fairmont, Clarksburg, and Morgantown.