We get an early start from Dehradun and travel all the way to Sankri, where we plan to arrive in the evening. After passing past a check station in Netwar, the remaining portion of the journey will take us through the Govind Pashu National Park. The guest house or one of the campgrounds is where we spend the night.

After finishing our breakfast, we will drive from Sankri to Taluka. The ride is a little rough in spots. The gravel route leading to the start of the walk is located in Taluka. The stroll is made more enjoyable by the sound of the Supin River crashing over rapids on each side of us, as well as the walnut, pine, and other trees that provide shade. On our route, we are often greeted by locals who are out and about. The trail goes through a several creeks, all of which eventually flow into Supin. After a couple of hours of hiking, the hamlet of Gangad can be seen to the left, located on the other side of the river. We go on with our trip, and after a little over an hour of walking, the picturesque town of Osla comes into view. Seema is a small community that may be found on the other side of the river from Osla. We either put up our tents here or make arrangements to stay in a hut with a local family in the nearby hamlet.

This day, we will continue trekking along the actual right side of the valley, which is parallel to the tonnes river. The path winds its way through the fields and eventually ascends well above the point where the Tonnes gad and the Ruinsara gad meet. The route through the forest is quite scenic, and it is possible to see Kalanag (6387) in the valley directly in front of you. We set our tent near to the waterfall and in close proximity to the stream.

We make our way up towards the valley of Ruinsara. The pine and fir trees give way to birch and rhododendron as the terrain changes, creating a striking contrast in the flora. The Ruinsara lake is a beautiful lake that is encircled on all sides by grassy meadows and bushes of rhododendron. The natives have a very high regard for its spiritual significance. Spend the night at one of the nearby campgrounds.

We are going to spend today relaxing close to the lake and then seeing the glaciers and valleys that are located nearby. On the other side of the river is a camp spot known as Thanga, and we might go there. The path that travels southward and eventually leads to the Bali pass departs from Thanga. There is a good probability of seeing Himalayan Brown Bears in the area near here. Alternately, we might go on the route that heads eastward along the left bank of the river and make our way up towards the base camp of Swargarohini (6,252 m) and Black peak (6,387 m). This path continues further up into the Dhumdhar Kandi pass, which is 5,490 metres in elevation and goes into the Gangotri valley.

We get an early start on the day since we will be going back over the same ground to Seema, which is located 17 km away. The trail is mostly sloped in a downward direction, with the exception of a brief and steep rise through the forest that we encountered on the third day of our trek.

We started our journey towards Taluka at an early hour in the morning after saying our goodbyes to the Seema. We are transported back to Sankri by a car from Taluka, and once we arrive, we check into one of the camps or guesthouses there.

This is the last day of the trek to Ruinsara Lake, and we will depart Sankri in the morning to make our way to Dehradun by the late afternoon.