Question: How tall is the highest point of the mountain ridge that bounds Broad Top plateau to the east?
Context: Walden Ridge (or Walden's Ridge) is a mountain ridge and escarpment located in Tennessee, in the United States.  It marks the eastern edge of the Cumberland Plateau and is generally considered part of it.  Walden Ridge is about 74 mi long, running generally north-south.  Its highest point is at Hinch Mountain (near Crossville), which reaches 3048 ft above sea level. Sideling Hill (also Side Long Hill) is a long, steep, narrow mountain ridge in the Ridge-and-Valley (or Allegheny Mountains) physiographic province of the Appalachian Mountains, located in Washington County in western Maryland and adjacent West Virginia and Pennsylvania, USA.  The highest point on the ridge is Fisher Point, at 2310 ft in Fulton County, Pennsylvania. Montagne Sainte-Victoire — in Provençal Occitan: "Venturi / Santa Venturi" according to classical orthography and Ventùri / Santo Ventùri according to Mistralian orthography — is a limestone mountain ridge in the south of France which extends over 18 km between the départements of Bouches-du-Rhône and Var.  Its highest point is the "Pic des mouches" at 1011 m ; this is not however the highest point in Bouches-du-Rhône, which is instead found in the Sainte-Baume massif.  The "Croix de Provence" is a notable feature of the mountain.  At a height of 19 metres, this cross, although not placed at the highest point of the mountain, stands out from the ridge far more than the Pic des Mouches. Rays Hill is a mountain ridge in Pennsylvania's Ridge and Valley Appalachians region.  It is bordered to the east by Sideling Hill.  About halfway along its run, the west side of Rays Hill ties into Broad Top Mountain, a large plateau.  On its west it is bordered by Tussey Mountain south of Broad Top Mountain and Rocky Ridge north of Broad Top Mountain. The Rattlesnake Hills is a 16-mile (26 km) long anticline mountain ridge in Yakima County and Benton County in the U.S. state of Washington.  Also known as Rattlesnake Mountain and Rattlesnake Ridge, it should not be confused with the much smaller Rattlesnake Ridge located near the west end of Ahtanum Ridge.  Rattlesnake Hills' highest summit is 3629 ft tall, which is also the highest point in Benton County.  The Rattlesnake Hills are part of the Yakima Fold Belt of east-tending long ridges formed by the folding of Miocene Columbia River basalt flows. Holston Mountain is a mountain ridge in Upper East Tennessee and southwest Virginia, in the United States.  It is in the Blue Ridge Mountains part of the Appalachian Mountains.  Holston Mountain is a very prominent ridge-type mountain in Tennessee's Ridge and Valley Region, about 28 miles (45 km) long, running from southwest to northeast, covering about 268 square miles (694 km²).  Its highest summit is "Holston High Point", on which a Federal Aviation Administration (FAA) aircraft navigational beacon is located, at an elevation of 4,280 feet (1,304.5 m) above mean sea level.  The second highest point is "Rye Patch Knob", at 4,260 feet (1,298.5 m) above mean sea level.  The third highest point is "Holston High Knob" where an old dismantled Cherokee National Forest fire tower (now a Communications Tower) marks the elevation at 4,136 feet (1,240.5 m) above mean sea level. Mount Kumotori (雲取山 , Kumotori-san ) stands at the boundary of Tokyo, Saitama, and Yamanashi Prefectures on the island of Honshū, Japan.  With an elevation of 2017 m , its summit is the highest point in Tokyo.  It separates the Okutama Mountains and the Okuchichibu Mountains.  While it marks the end of the Ishione (石尾根) mountain ridge that begins near the JR Okutama Station, the highest mountain ridge in Tokyo, its remote location amongst a group of mountains from both mountain ranges makes access difficult. Broad Top is a plateau located in south-central Pennsylvania.  It extends into Huntingdon County to the north, Fulton County to the southeast, and Bedford County to the southwest.  It is bounded to the west by Saxton Mountain and Terrace Mountain, and to the east by Sideling Hill.  In Bedford County, Harbor Mountain forms the southern boundary.  Trough Creek Valley lies between the mountains. Robertsdale is an unincorporated community in Wood Township in southern Huntingdon County, Pennsylvania, United States.  It is situated on Broad Top Mountain near the eastern slope.  It was founded in 1872 as part of the construction of the East Broad Top Railroad and Coal Company as the original terminus and mining location.  The town was created by the EBT's parent company, the Rockhill Iron and Coal Company, which operated most of the mines on the east side of the Broad Top Coal field.  The initial focus of mining was the Houk Mine (renamed Rockhill Iron and Coal Mine #1) which predated the town, though as a much smaller producer.  Later RI&C #5 became a large producer.  Mines #2, #3 and #4 were in Robertsdale but were not large producers and operated only briefly.  Later the EBT was extended to Woodvale, Alvan and new Alvan as the focus of mining moved along the coal seams, though Robertsdale remained the mining headquarters.  Robertsdale was a typical coal ming town complete with company owned miner houses, a company store, a company owned water and power system and other company owned facilities.  Coal mining and its support industries were the principal employers. Little Cacapon Mountain ( or ) is a mountain ridge of the Ridge-and-valley Appalachians in Hampshire County, West Virginia, United States.  The mountain takes its name from the Little Cacapon River, a Potomac River tributary that lies on its western flanks.  Little Cacapon Mountain reaches its highest point of 1575 ft in the vicinity of Barnes Mill.  It spans from the Frenchburg area, where it is joined by Chestnut Oak Ridge, to the Slanesville Pike where Crooked Run forms a gap between Little Cacapon Mountain and Queens Ridge near Higginsville.
Answer: 2310 ft