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===Optional day: Dickson Glacier===
First, it is necessary to cross the river in a zodiac, available during the summer months, which can be booked at the campsite. A flag in the place gives notice of leaving trekkers. Once on the other side of the lake, walk up the slope to get on the path leading to Paine lake. To the left there is a hill and to the right the Paine River. The trail continues north around a rock plateau located to the left, untill it reaches an open field. The unusual north face of Torres del Paine can be observed, and the range that leads to Paso John Garner (the one that will be faced in two more days).
After 30-35 minutes you will find stakes at the left of the road, traces of an old fence. A sign indicates to "Carabineros" (police). At that point you should turn left and continue parallel to the stakes towards the Dickson glacier. The trail is fuzzy on this stretch, so it is important tofollow the old fence or the orange stakes, in a rather flat terrain. To the left there is a rock plateau. Then you will enter a wooded area, and in a short while you will cross a stream. After 10 minutes the trail turns to the left, towards a gorge, where a there is a pass. But our route ascends a hill and then goes through the side of a scree.
[[Imagen:Glaciar Los Perros desde sector Campamento Los Perros por Heinz Weber.jpg|thumb|280px|Glacier Los Perros from Los Perros camp, ny Heinz Weber]]
The day starts with the path marked by a flag, which leads to a dense forest composed mainly of ''lengas'', but also by ''coigües'' and ''notros''. After 15 minutes you will be see at your back Dickson Lake and the glacier of the same name. At 350 meters of altitude you must cross an old fence. A more mature forest follows, and a wooden walkway follows.
Then there is a great viewpoint in an open partly-flooded space. There is a small hill with good views. The trail turns left along the marshy area and then descends to the Cabeza del Indio River, where a wooded bridge. The track then climbs a muddy area and advances to the southwest along the Los Perros river valley. After about half an hour from Cabeza del Indio there will be a waterfall. The trail continues next to the river, with little slope, under the shadow of the forest, interrupted by occasional fallen trees and frequent streams of fresh water.
====Side hike to Punta Puma Glacier====
From Los Perros, follow the track that leads to the pass. After crossing the river by the bridge, continue straight along the river O'Brien instead of turning left towards the pass. You will walk by the river in a space devoid of vegetation. When it's no longer possible to continue on this course, make your re-entry to the forest. The trail is blurred and it lacks signs, but it's easy enough to advance parallel to the river, under the shade of a dense forest. Then you will walk up a hillside and the river will be visible down, in a narrow bed.
After about 25 minutes, you will reach an area of scrubby vegetation growing on the moraine, from which point the Punta Puma glacier is already visible.
* '''Total expected time for this section''': 1h to the glacier, 45' back
===Day 4: Los Perros - Paso John Gardner - Guardas===
[[imagen:Paso_John_Garner.jpg|thumb|280px|To John Gardner pass, looking west. Feb. de 2002. File: Francisco Reyes]]
This is the hardest day. From Los Perros continue down the path across the river by the footbridge. Then turn left, heading towards the Pass. The trail has been marked in the trees for some stretch. Then cross a swampy area (it's the only part of the whole trek where gaiters would de helpful) that will last for the next hour. There are some open areas with good views.
After an hour and a half, at 760m, the trails approaches the Paso river, Cross guided by the orange markings on a narrower section. It is important to get this place right, because it is not easy to cross at other points. The path continues climbing on the other side of the river, leaving behind the swampy area. Now it is usually windy, and the terrain rocky, with the orange markings on the rocks. From several hundred meters below the pass, it becomes likely to find snow even in the summer months. If there is rain forecasted for the park, it is likely that here it will snow.
[[File: Glaciar_grey_bajando_del_paso.jpg | thumb | 280px | right | Glacier Grey and Southern Ice Fields from the drop step. Feb. 2002 File: Francisco Reyes]]
John Gardner pass is at 1200 m., 1 ½ hours beyond the river crossing. It allowes to cross the massif of the Cordillera del Paine to the western sector of the park. The views of the Southern Ice Fields and Grey Glacier are spectacular, so, coupled with the possibility of snowfall described, it is strongly suggested to do it only with good weather. There are orange rods that serve to guide the way when the weather worsens the visibility. The descent follows a moraine, always with stunning view. The retreat of the glacier can be appreciated: the former nunatak is now a peninsula, and has recently appeared a second nunatak. After 15 minutes of descent, at 950m. the first glimpses of vegetation appear, with some ''lengas'' dwarfed and bent by the wind. As you walk through the forest, the glacier is visible through the branches. The descent is steep and demanding.
At 550 m. and after just under 2 hours of descent, an old camp sector is reached. It's a rather narrow place, nestled among the trees, indicated by the sign "Camp El Paso." Continue in a southerly direction parallel to the glacier. There are some areas with large ''lengas''.
* Sleeping bag: Torres del Paine is not very cold during the summer, so a midrange sleeping bag is okey
* Sunscreen
* Penknife, lightweight plastic cookware
==== Desirable gear ====