Rohtang Pass :- ( 51 km. ) At an altitude of 3,978 metres on the highway to Keylong, the mass affords a wide-spread panorama of mountain scenery. Here eye meets a range of precipitous cliffs, huge glaciers and piled moraine and deep ravines. To the opposite is the well defined 'Sonepani Glacier' slightly to the left are the twin peaks of the Geyphang snow crowned. The Beas river rises near the crest of Rohtang from a block of Mica-Schist. To its left, 200 metres higher, is the little lake of 'Sarkund' ( Dashahr ) visited by a large number of people every year. The bath in the water of Sarkund lake effects cure of all bodily ailments or imaginary. The pass is open from June to October each year although trekkers can cross it earlier. It is the gateway to Lahaul-Spiti, Pangi and Leh valley.