Definition that contains monongahela river
- pittsburgh a city in southwestern Pennsylvania where the confluence of the Allegheny River and Monongahela River forms the Ohio River; long an important urban industrial area; site of Carnegie Mellon University and the University of Pittsburgh
- morgantown a city in northern West Virginia on the Monongahela river near the Pennsylvania border; site of the University of West Virginia
- allegheny a river that rises in Pennsylvania and flows north into New York and then back south through Pennsylvania again to join the Monongahela River at Pittsburgh which is the beginning of the Ohio River
- allegheny river a river that rises in Pennsylvania and flows north into New York and then back south through Pennsylvania again to join the Monongahela River at Pittsburgh which is the beginning of the Ohio River