Question: Col des Roches is a mountain pass in the Western Alps in what sub-alpine mountain range?
Context: The Col des Aravis is a mountain pass in the French Alps that connects the towns of La Clusaz in Haute-Savoie with La Giettaz in Savoie.  At 1486 m. it is the lowest pass in the Aravis Range of mountains. The Vanoise massif is a mountain range of the Graian Alps, located in the Western Alps.  After the Mont Blanc Massif and the Massif des Écrins it is the third highest massif in France, reaching a height of 3,885m at the summit of Grande Casse.  It lies between Tarentaise Valley to the north and the Maurienne valley in the south.  The range is the site of France's first National Park in 1963, the Vanoise National Park.  The ski resorts of Tignes and Val-d'Isère and the 2,770m high Col de l'Iseran are located in the eastern part of the range. Col des Montets (elevation 1461 m ) is a mountain pass in the French Alps in the Haute-Savoie department of France.  It is on the road between Chamonix, the Swiss Col de la Forclaz and Martigny in the canton of Valais, Switzerland. Col de la Forclaz (el.  1527 m ) is a mountain pass in the Alps in the Canton of Valais in Switzerland.  It connects Martigny at 471 m and Le Châtelard (Finhaut).  The road from Martigny to the Col has an average gradient of 6% but in parts is closer to 8%.  After the Col, and Le Châtelard, the road leads to Chamonix in France via Vallorcine and the Col des Montets. The Chablais Alps are a mountain range in the western Alps.  They are situated between Lake Geneva and the Mont Blanc Massif.  The Col des Montets separates them from the Mont Blanc Massif in the south, and the Rhône valley separates them from the Bernese Alps in the east. Col des Mosses (altitude 1445 m) is a mountain pass in the western Bernese Alps of Switzerland.  The pass is located in the municipality of Ormont-Dessous in the canton of Vaud.  It links Aigle, to the south in the valley of the Rhone, with Château-d'Œx, to the north in the valley of the Sarine, and is flanked to the west by the Mont d'Or and to the east by the Pic Chaussy. Col des Planches (el.  1411 m.) is a high mountain pass in the Alps in the canton of Valais in Switzerland.  The road to the Col runs from Martigny at 471m with an average gradient of about 9%, over Col des Planches then down to Sembrancher at 717m with an average gradient of 7% Col des Roches (el.  919 m.) is a mountain pass in the Jura Mountains on the border between the canton of Neuchâtel in Switzerland and France. The Jura Mountains (] ; ] ) French: "Massif du Jura" , (German: "Juragebirge" , Italian: "Massiccio del Giura" ) are a sub-alpine mountain range located north of the Western Alps, mainly following the course of the France–Switzerland border. The Grison Alps are the mountains of the Graubünden canton of Switzerland (Grisons being the English name for the Graubünden region).  There are many significant peaks in the Grison Alps, including the Tödi (3,614 m) and the highest peak, Piz Bernina (4,049 m).  Many of the mountain ranges feature extensive glaciers, such as at the Adula, the Albula, the Silvretta, the Bernnina or the Rätikon range.  The Grison Alps include parts of both the Eastern Alps and the Western Alps.  The Eastern Alps located in Graubünden are the Rhaetian Alps, which is part to the Central Eastern Alps.  The Rhaetian Alps consists of the following mountain ranges: Samnaun Alps, Rätikon, Silvretta, Sesvenna Range, Albula Range, Plessur Range, Oberhalbstein Range, Livigno Range, Bregaglia Range and the Bernina Range.  The Western Alps located in Graubünden, include portions of the Lepontine Alps and the Glarus Alps.
Answer: the Jura Mountains