The most popular trek originating from Sonmarg is the Kashmir Lake Trek. It covers the lakes of Gangabal, Vishansar, Kishansar, and goes close to the Harrnukh peak. The trail first crosses the Nichinai Pass (13,387 ft) and then enters the alpine valleys that eventually lead to the Gangabal Lake. Vishansar (Vishnu’s Lake) is at just over 12,000 feet and slightly larger than the 12,500 feet Kishansar (Krishna's Lake). Gangabal Lake is the highlight of this trip. Protected by the three peaks of Mount Harrnukh, Gangabal is 5 miles in circumference and offers the finest trout fishing anywhere in Kashmir.
http://trekkashmir.com/Short_Treks.htm
https://alpinelakestrek.com/