Through a wide valley there is a path which was unkown for long. May be it was part of the ancient Silk Road?
It is the path from Tash Rabat to Chatyr Kol.
From Tash Rabat you may hike to the Panda Pass, crossing the height of the At Bashy mountain range and then follow the steep path down to the Chatyr Kol lake. It's a one day hike if you get a pick up by car close to the lake.