The Tarsar Lake is dominated by the peaks of the Kolahoi mountain massif some 20 km to the east. The lake is separated by a mountain with a minimum peak elevation of 4,000 metres (13,000 ft) from another lake of the same nature known as Marsar Lake, which is in the vicinity of Dachigam National Park. Together these two lakes are referred to as the twin sisters. The 16th-century Kashmiri ruler Yusuf Shah Chak mentioned the twin lakes in his poetry, writing to his beloved: “When I remember the two tresses of the comely beloved, Tears begin to flow from my eyes like streams from Tarsar and Marsar.”
The Tarsar Lake is drained by an outlet stream which falls into the Lidder River at Lidderwat, 15 km to the east. Being the nearest seasonal settlement, Lidderwat is located on the trek route to the lake from Aru, Pahalgam. The Marsar Lake on the other hand drains out and flows in the opposite direction of the Tarsar Lake.
During the winter, the Tarsar Lake freezes and is covered by heavy snow; it has floating ice even in the summer. The basin of the lake is surrounded by a sheet of alpine flowers. The geum, blue poppy, potentilla and gentian are relatively common. Hedysarum flowers are found in late spring throughout the area around the lake.
During summer there are breeding colonies of migratory birds, including bar-headed geese, lammergeyers, high-flying choughs, Himalayan golden eagles, cinnamon sparrows and black bulbuls. The basin of Tarsar and the adjoining Dachigam National Park constitute one of the most important habitats of the Kashmir stag (hangul), ibex, musk deer, snow leopard, Himalayan brown bear and in the higher reaches, the golden marmot.
(source:jktourism.org). The address of Tarsar Lake, Pahalgam is Pahalgam
It's in Pahalgam