Reach at Taluka from Sankri, the trek begins from Taluka. With the Supin river flowing beside, the walk is quiet pleasant. The path will cross over the Supin river, keep walking through the village of Gangad and gradually the village of Osla will appear. The Seema village is tiny settlement opposite to the river from Osla.

From Osla the trail gradually gets higher, the ascending path climbs high above the confluence Supin river from the Ruinsara Valley. The Har Ki Dun appears, it is located in the midst of two valleys- one originating from the Jaundhar Glacier and other from beyond Hata glacier.

While trekking to the Ratha Tho you will cross the Marinda Tal, a small lake. The path ahead is a bit over the boulders, but the snow clad peaks and panoramic view makes the walk worth every step.

This path is more over boulders and is covered with snow on most of the areas. The campsites on Upper Lamjung are usually covered with snow all over. The climb however opens up to an ecstatic view of the valley left behind.

Distance-As you keep moving higher up the scenery keeps getting wider and better. The cradle shape Borasu Pass appears after crossing two boulders with a final ascent over these boulders. Descending towards the Himachal side of the pass into the large glacier over the initial slope, the trek is further along a tributary of Baspa River, you may find many shepherds along the way.

A long trek of 8 hour with an easy walk through flower fields and forest. Stay overnight in Chitkul Village. The trek ends here. From here you can have public or private transport from Chitkul or Sangla to Sankri.