Question: There is a mountain range that is located south-west of the Marigny in Valais and is the highest and most extensive mountain range system that lies entirely in what country?

Context articles: Mont de l'Arpille
Coast Mountains
Aconcagua
Hanthana Mountain Range
Qaflankuh Mountain Range
Huallanca mountain range
Elkhead Mountains
Sierra de Gredos
Hex River Mountains
Alps

Mont de l'Arpille is a mountain of the Alps, located south-west of Martigny in the Swiss canton of Valais.
 It is located north of the Col de la Forclaz and geographically part of the Mont Blanc massif.
The Coast Mountains are a major mountain range in the Pacific Coast Ranges of western North America, extending from southwestern Yukon through the Alaska Panhandle and virtually all of the Coast of British Columbia south to the Fraser River.
 The mountain range's name derives from its proximity to the sea coast, and it is often referred to as the Coast Range.
 The range includes volcanic and non-volcanic mountains and the extensive ice fields of the Pacific and Boundary Ranges, and the northern end of the volcanic system known as the Cascade Volcanoes.
 The Coast Mountains are part of a larger mountain system called the Pacific Coast Ranges or the Pacific Mountain System, which includes the Cascade Range, the Insular Mountains, the Olympic Mountains, the Oregon Coast Range, the California Coast Ranges, the Saint Elias Mountains and the Chugach Mountains.
 The Coast Mountains are also part of the American Cordilleraa Spanish term for an extensive chain of mountain rangesthat consists of an almost continuous sequence of mountain ranges that form the western backbone of North America, Central America, South America and Antarctica.
Aconcagua (] ) is the highest mountain outside Asia, at 6961 m , and by extension the highest point in both the Western Hemisphere and the Southern Hemisphere.
 It is located in the Andes mountain range, in the Mendoza Province, Argentina, and lies 112 kilometres (70 mi) northwest of its capital, the city of Mendoza.
 The summit is also located about five kilometres from San Juan Province and 15 kilometres from the international border with Chile.
 The mountain itself lies entirely within Argentina and immediately east of Argentina's border with Chile.
 Its nearest higher neighbor is Tirich Mir in the Hindu Kush, 16520 km away.
 It is one of the Seven Summits.
The Hanthana Mountain Range lies in central Sri Lanka, south-west of the city of Kandy.
 It was declared as an environmental protection area in February 2010 under the National Environment Act.
 The maximum height of the range is 3800 ft. The mountain range consists of seven peaks.
 The highest one being the "Uura Kanda".
 The range is a favourite destination among the mountain hikers in Sri Lanka.
 University of Peradeniya is situated adjacent to the Hanthana mountain range.
Qaflankuh or Qaflankuh Mountain Range (Persian: رشته کوه‌ها‌ی قافلانکوه / Reshteh Kuh-hā-ye Qāflānkuh) is a mountain range that is located about 20 kilometres north of the city of Zanjan in Zanjan Province, Iran.
 With an average width of almost 20 kilometres and a length of about 100 kilometres, this mountain range is stretched in a northwest-southeast direction, beginning from northwest of Zanjan, passing north of Zanjan and ending southeast of Zanjan.
 The Qezel Owzan River flows in a valley that separates Qaflankuh Mountains on the south from Talish Mountains on the north.
 With an elevation of 2971 metres, Mount Sendan Dagh is the highest mountain of the range which is located in the southeast section of this mountain range.
 There are some mineral hot springs containing sulphur in different parts of this range.
 Geologically, Qaflankuh Mountain Range was formed during the Tertiary volcanism and plutonism and is made mainly of the Eocene volcanic rocks with very small sections of intrusive rocks in the northern and southern parts of the range.
The Huallanca mountain range (possibly from Quechua, "wallanka" mountain range; a cactus plant ("Opuntia subulata"); name of several localities and name of a mountain in the Wallanka range, also spelled "Huallanca"), Chawpi Hanka ("central ridge (or peak)", "Chaupi Janca, Chaupijanca") or Shikra Shikra ("sikra" woven basket, "many baskets", "Shicra Shicra") lies in the Andes of Peru.
 It is located in the Ancash Region, Bolognesi Province.
 The Wallanka mountain range is a small range southeast of the Cordillera Blanca and north of the Waywash mountain range extending between 9°52' and 10°03'S and 76°58' and 77°04'W for about 19 km in a northeasterly direction.
The Elkhead Mountains are a mountain range in Colorado.
 The mountain range is considered to be low altitude within Colorado as the mountains are under 11000 ft .
 Located within Routt and Moffat counties, the mountain range is far from metropolitan areas and has few lakes and streams, so it attracts few visitors.
 The mountain range is a volcanic range and all of the peaks were formed by volcanic action.
 The mountain range extends approximately 16 mi east to west and 10 mi north to south, and its center is located at , approximately 20 mi northeast of Craig and north of Hayden, Colorado 13 mi south of the Wyoming border.
 Almost all of the peaks within the Elkhead Mountains are a part of Routt National Forest.
 Significant peaks are: Bears Ears, Sugar Loaf, Saddle Mountain, Black Mountain, Pilot Knob, and Meaden Peak.
The Sierra de Gredos is a mountain range in central Spain that spans the provinces of Ávila, Salamanca, Cáceres, Madrid, and Toledo.
 It is part of the much larger Central System of mountain ranges.
 Its highest point is Pico Almanzor, at 2,592 metres and it has been declared a natural park by the Autonomous Community of Castile and León.
 The Sierra de Gredos is one of the most extensive mountain ranges of the Central System; it comprises five river valleys: the Alto Tormes, the Alto Alberche, the Tiétar Oriental, the Tiétar Occidental y la Vera, and the Valle del Ambroz.
 The first known inhabitants were the Vettones, a pre-Roman Celtic people.
 The central part of the range encomprises the Sierra de Gredos Regional Park.
The Hex River Mountains (Afrikaans: "Hexrivierberge" ) make up the second highest mountain range in the Western Cape province of South Africa and are located 120 kilometres (75 miles) north-east of Cape Town.
 They form part of a large anticline in the Cape Fold Belt mountain system and form a north-east, south-west trending mountain system forming the core of the Cape Syntaxis between the towns of Worcester and De Doorns.
 They are mostly composed of Table Mountain sandstone and most peaks reach 2,000 metres (6,562 feet) in height or more.
 The highest mountain is Matroosberg at 2,249 metres (7,379 feet), making it the second tallest peak in the province after Seweweekspoort Peak in the Swartberg Mountain Range.
The Alps ( ; French: "Alpes" ] ; German: "Alpen" ] ; Italian: "Alpi" ] ; Romansh: "Alps" ; Slovene: "Alpe" ] ) are the highest and most extensive mountain range system that lies entirely in Europe, stretching approximately 1,200 km across eight Alpine countries: Austria, France, Germany, Italy, Liechtenstein, Monaco, Slovenia, and Switzerland.
 The mountains were formed over tens of millions of years as the African and Eurasian tectonic plates collided.
 Extreme shortening caused by the event resulted in marine sedimentary rocks rising by thrusting and folding into high mountain peaks such as Mont Blanc and the Matterhorn.
 Mont Blanc spans the French–Italian border, and at 4810 m is the highest mountain in the Alps.
 The Alpine region area contains about a hundred peaks higher than 4000 metres (just over 13,000 feet).