MONONGAHELA RIVER: Latitude = 40.442222, Longitude = -80.013610, Zoom=14
Right Clicking anywhere on the map displays latitude, longitude, and address at that location.
Navigation mile 0.0 of the Monongahela River is at mile 0.0 of the Ohio
River, in Pittsburgh, PA. The navigable portion of the Monongahela includes its whole length of 128.73 miles.
The river begins at the confluence of the West Fork and the Tygart Valley River in Marion County, West Virginia.