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Short Itinerary
Day 1: Dehradun to Sankri - 8 h drive
Day 2: Sankri (1,920 m) to Seema/Osla (2,200 m) - 1 h drive + 5-6 h trek
Day 3: Seema/Osla to Har ki Dun (3,510 m) - 4-5 h
Day 4: Har ki Dun to Ratha Tho (4,200 m)- 4-5 h
Day 5: Ratha Tho to Borasu pass base camp (Upper Lamjung)(4,900 m)- 3-4 h
Day 6: Borasu pass base camp (Upper Lamjung) to Bonga (4,000 m) via Borasu pass (5,360 m)- 7-8 h
Day 7: Bonga to Chitkul (3,430 m)- 7-8 h
Detailed Itinerary
Day 01 : Dehradun to Sankri drive : 7 hours' drive 190 km
We start early from Dehradun and reach the village Sankri by evening. The final stretch is through the Govind Pashu National Park after we cross a check post at Netwar. We rest at night in a guest house or in camps.
Day 02 : Sankri (1,920 m) to Seema (2,560 m) via Taluka (1,800 m) : 1 hour drive 5-6 hours' hike: 14 km
Post breakfast we are transported from Sankri to Taluka. The drive is a bit bumpy. The trek commences from Taluka on a stony path. With the river Supin gushing through rapids beside us, under the shade of walnut, pine and other trees, the walk is quite pleasant. Often the passing villagers greet us on the way.
The path crosses over a few streams which merge with Supin. After a few hours of walk the village of Gangad can be seen towards the left, across the river. We continue our hike and after about an hour's walk, the quaint village of Osla unfolds itself. Seema is a tiny settlement opposite to the river from Osla. We set camp here or stay in a hut with a local family in the village.
Day 03 : Seema/Osla to Har ki Dun (3,510 m), 4-5 hours' hike : 10 km
From Osla the trail gradually rises higher and passes through bushes of flowers like orchids, fleece flowers and sunflowers. The ascending path climbs high above the confluence of Supin river and the river from Ruinsara valley.
After traversing higher up along the left side of the river, we camp at a very panoramic spot in Har ki Dun, located at the junction of two valleys - one originating from Jaundhar glacier and the other from beyond Hata glacier.
Day 04 : Har ki Dun to Ratha Tho (4,200 m), 4-5 hours hike: 5 km
Today we trek at moderate pace to reach Ratha Tho. On the wasy, we pass by Morinda Tal, a small lake. A part of the trek is a bit over boulders but with the views of snow covered peaks and wide valleys, it is a beautiful walk.
Day 05 : Ratha Tho to Borasu pass base camp (Upper Lamjung) (4,900 m), 3-4 hours hike: 4 km
On this day, we walk higher up. The path is over boulders and quite often snow covered. The campsite at upper Lamjung is also on snow mostly. From here one gets a beautiful view of the valley behind.
Day 06 : Borasu pass base camp (Upper Lamjung) to Bonga (4,000 m) via Borasu pass (5,360 m) , 7-8 h hike: 8 km
We start before sunrise for this day's trek. As we keep moving higher up, the views open up behind us. After crossing two glaciers and a final ascent over boulders, the cradle shaped Borasu pass lies before us. We descend towards the Himachal side of the pass into a large glacier usually glissading over the initial slope. The trek further is along a tributary of Baspa river. We may find shepherds near the campsite.
Day 07 : Bonga to Chitkul (3,430 m), 8 hours hike: 15 km
Today's trek takes about 8 h. This is an easy walk through flower fields and forests. Overnight in Chitkul Village. The trek ends here. One can get public or private transport from Chitkul or Sangla to Shimla.
