Question: What ridge is part of the Appalachian Plateau

<P0-S0> The Piedmont Mountains are outlying mountains, sometimes called “low mountains”, that typically occur in the western Piedmont near the Blue Ridge. <P0-S1>  Most of the features within the Piedmont physiographic region of North America lie either on the eastern border where the plateau plunges onto the Coastal Plain at the Fall Line, in the broad valleys of the river systems, or on the western border where Piedmont Mountains likely occur. <P0-S2>  Occasionally, due to diverse rock formations, folds and outcroppings, these mountains can rise at various locations across the Piedmont like the Uwharrie Mountain Range in North Carolina or the Pine Mountain Range in Georgia. <P0-S3>  Most of these mountains, or hills, are what is left of ancient eroded mountains. <P0-S4>  Some, like Stone Mountain in Georgia, are solitary rock domes called Monadnocks which become further exposed with erosion. <P0-S5>  The Piedmont is part of the greater Appalachian Mountain Range and is also referred to as the Appalachian Plateau. <P0-S6>  The French definition of piedmont in itself translates as foothill; however, a Piedmont Mountain may be that of greater significance or prominent elevation. <SEP> <P1-S0> Walden Ridge (or Walden's Ridge) is a mountain ridge and escarpment located in Tennessee, in the United States. <P1-S1>  It marks the eastern edge of the Cumberland Plateau and is generally considered part of it. <P1-S2>  Walden Ridge is about 74 mi long, running generally north-south. <P1-S3>  Its highest point is at Hinch Mountain (near Crossville), which reaches 3048 ft above sea level. <SEP> <P2-S0>  It includes much of eastern Kentucky and Tennessee, and portions of northern Alabama and northwest Georgia. <P2-S1> The Cumberland Plateau is the southern part of the Appalachian Plateau in the Appalachian Mountains of the United States. <P2-S2>  The terms "Allegheny Plateau" and the "Cumberland Plateau" both refer to the dissected plateau lands lying west of the main Appalachian Mountains. <P2-S3>  The terms stem from historical usage rather than geological difference, so there is no strict dividing line between the two. <P2-S4>  Two major rivers share the names of the plateaus, with the Allegheny River rising in the Allegheny Plateau and the Cumberland River rising in the Cumberland Plateau in Harlan County, Kentucky. <SEP> <P3-S0> The Wallkill Valley is a broad valley extending through southeastern New York and northwestern New Jersey. <P3-S1>  It is composed of rolling hills, plains, and swamps (including the Black Dirt Region) surrounding the Wallkill River. <P3-S2>  The valley is a subdivision of the larger Hudson Valley, bound to the west by the Shawangunk Ridge/Kittatinny Mountains and to the east by the Marlboro Mountains and New York–New Jersey Highlands. <P3-S3>  The northern Wallkill Valley is sometimes associated with the greater Catskills region, although it is geographically separated from the Catskill Mountains by the Shawangunk Ridge and Rondout Valley. <P3-S4>  In a broader sense, the Wallkill Valley is part of the Ridge-and-Valley physiographic province of the Appalachian Mountains, while the Catskills further to the north and west are part of the Appalachian Plateau.