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It is named for the striking rock formation on the adjacent Catoctin Mountain, which were formed by the Potomac River cutting through the ridge in a water gap, a typical formation in the Ridge-and-Valley Appalachians.
From its headwaters near Interstate 81, the river flows southeast through several water gaps in the Ridge-and-Valley Appalachians, ending at its confluence with the Schuylkill River in Schuylkill Haven.
The boundary between the Western Carpathians and the Eastern Alps is formed by the Vienna Basin, the Hainburg Hills of the Little Carpathians at Devín Gate, and a gap carved by the Danube.
Regionally, McDade was the principal advocate for the Tobyhanna Army Depot and was instrumental in establishing the Delaware Water Gap Recreation Area, the Steamtown National Historic Site, and the National Fishery Laboratory in Wellsboro.
Mount Minsi, a hill on the Pennsylvania side of Delaware Water Gap
The Frankstown Branch Juniata River runs north along the west foot of the ridge before turning east along U.S. Route 22 at Water Street, the river, road, and rail (abandoned PRR Petersburg Branch) crossing the ridge line through a water gap.
The Little Juniata River passes through a nearby water gap at Spruce Creek along with the former Pennsylvania Railroad Main Line, which tunnels through a spur of the mountain to cut across a loop in the river.