@adsatinder ji
That place is called Sangla Kanda.
There are two roads to reach there.
one from Sangla , just opposite Hotel Himadri International, where I stayed. And other one is beyond Baspa Reservoir view point.
Search for Rupin pass trek , Sangla Kanda trek, Sangla Kanda Lake etc .
My friend Panshul Mehta of
www.seekinghimalayas.com organizes trek to Sangla Kanda.
Sangla Kanda - Chansu Trek | Seeking Himalayas
4x4 vehicle can reach Sangla Kanda.
Video=
This is video of Sangla Kanda Lake
If anybody wants to visit this place, then call
+91 980 599 38 37
+91 980 511 90 98
Seeking Himalayas