question: Refuge Robert Blanc is a refuge in the Alps located on the route of a popular walk that is roughly how long?
answer: 170 km
context: Title: Tour du Mont Blanc
  Passage: The Tour du Mont Blanc or TMB is one of the most popular long-distance walks in Europe.  It circles the Mont Blanc massif, covering a distance of roughly 170 km with 10 km of ascent/descent and passes through parts of Switzerland, Italy and France.
  Title: Refuge du Théodule
  Passage: Refuge du Théodule is a refuge in the Pennine Alps located at the Theodulpass between the Mattertal and Valtournanche in the Aosta Valley, Italy.
  Title: Gonella Hut
  Passage: The Gonella Hut (French: "Refuge Francesco Gonella"; Italian: "Rifugio Francesco Gonella" and sometimes called "Rifugio del Dôme"; or "Refuge du Dôme") is a high altitude mountain hut in the Aosta Valley in the Mont Blanc massif area of the Alps.  It lies at an altitude of 3071 metres, above Val Veny near Courmayeur in Italy.  The refuge is located on the Italian 'normal route' to Mont Blanc.
  Title: Refuge Robert Blanc
  Passage: Refuge Robert Blanc is a refuge in the Alps at an altitude of 2,750 m, located on the route of the Tour du Mont Blanc.
  Title: Grands Mulets Hut
  Passage: The Grands Mulets Hut (French: "Refuge des Grands Mulets") is a mountain refuge in the Mont Blanc massif in the French Alps at an altitude of 3,051 m.  It is owned by the Club Alpin Francais.  The hut is located on a pyramidal rock island, at the junction of two streams of the Bossons Glacier on the north side of Mont Blanc.  If the state of the glacier is not too severe, the hut is wardened in summer and can be used as an alternative route of ascent to the summit of Mont Blanc, following the original historic route by the first ascensionists.  Nowadays the hut is used more frequently by ski-mountaineers in spring, or as a more sheltered and alternative route of descent from Mont Blanc than the much more popular Gouter route, though route-finding can be difficult in fog and requires prior knowledge of the crevassed state of the Bossons glacier below the hut.
  Title: Refuge du Promontoire
  Passage: Refuge du Promontoire is a refuge in the Alps located in France in the massif des Ecrins, it is just build on rock in front of the South face of La Meije.  It's the starting point of the famous crossing of La Meije, which is known to be one of the most beautiful mountain run into the Alps.
citations: Refuge Robert Blanc Tour du Mont Blanc