The peak Boum is one spectacullar rocky pyramid, an easily recognizable silhouette in the massif of Maupas-Perdiguero. Due to that nearby the summit of the highest and known peak Maupas, it's not the first option generally for the mountaineers that visit the zone for the first time, but it's a very recommendable ascent for a second day or a good excuse to have the opportunity another time to visit the valleys of Benasque or Lis. This massif serves of border between France and Spain that supposes to have two routes with completely different trailheads separated by many km of road. The easiest and normal route is that of the north side (France) but many Spanish mountaineers use the route of the valley of Remuñe in Benasque to avoid the long itinerary of car.
When we contemplate the mountain is easy to guess that the route is not a simple walk due to its conical and vertical forms but the climb of normal route is not difficult for the people with something of experience (PD-, II) not being needed the use of material of rock-climb. Of all the normal route the majority is a simple degree I or I+ and is only in less than 3 meters, in the final part that access to the top, where is found the chimney of II. The itinerary is exposed for which only it's recommended for mountaineers with experience. It's possible to climb the peak in one day (important slope of 1900m) or two days, with the use of refuge of Maupas.
The Spanish route is most difficult and it has some rock-climbs of II and one of II+ before the final ridge (rappel advisable for the descent).
At last, it's possible the climb of Maupas and Boum in the same day from the normal routes (French side), but the itinerary is very long. You must traverse to the glacier north of Maupas, descending to a point of 2750m to entry in the normal route of Boum and you’ll need to gain anothers 250 meters of slope. To climb both peaks it's better the use of the refuge of Maupas (from the valley the total slope is 2400 meters).
: approach to Luchon. From the west across Pau and Tarbes we reach the road to Bagnéres de Luchon. In Luchon we follow the little road to the ski-resort of Superbagnéres and we leave it in the signal “Vallée de Lis”. We’ll reach the parking of Aubergue de Lis (1100m).
: Benasque is reached from Huesca taking N-330 to Sabiñanigo and across Ainsa and Campo for the N-260. The trailhead is the road no finished near of Hospital de Benasque where's the entry of valley of Remuñe.
Boum from Maupas
It's a natural park in both sides with rules about conservation of nature and the camping.
The refuge of Maupas it's very little in it's advisable the reserve early if you want to use it from 15 June to 15 September. Out of the season the winter hut is available.
Refuge de Maupas
The camping it’s not allowed, it’s national park, but the refuge of Maupas it’s a very good option (30 places, Tel: 05.61.44.21.60, out of France: 33 220.127.116.11.60. Opened from 15 June to 15 September).
The Aubuerge de Lis it’s opened from July to September but as well you had hotels and lodges in Luchon or the ski resort of Superbagnères.
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