The Casselman River is a 56.5-mile-long (90.9 km) tributary of the Youghiogheny River in western Maryland and Pennsylvania in the United States. The Casselman River drains an area of 576 square miles.
The Casselman River in Casselman River Bridge State Park near Grantsville, Maryland
The Youghiogheny River, or the Yough for short, is a 134-mile-long (216 km) tributary of the Monongahela River in West Virginia, Maryland, and Pennsylvania. It drains an area on the west side of the Allegheny Mountains northward into Pennsylvania, providing a small watershed in extreme western Maryland into the tributaries of the Mississippi River. Youghiogheny is a Lenape word meaning "a stream flowing in a contrary direction".
Ohiopyle Falls on the Youghiogheny in Ohiopyle State Park in Pennsylvania
Youghiogheny Lake and Dam on the Youghiogheny River near Confluence, Pennsylvania
The Lower Yough: One of the most actively run sections of whitewater east of the Mississippi River
Youghiogheny River at West Newton, Pennsylvania