JHYLUM, JELUM, BEHUT, or VIDUSTA, the ancient Hydaspes, a large river of Hindustan, which has its rise in the S.E. corner of the valley of Cashmere, in the great Himalaya ridge of mountains. It is there called Vidusta, and passes through two lakes E. and W. of the town of Cashmere. It is joined, 10 miles below the town, by the Little Sind, and receives many small rivulets in its course through the valley and hills, which it enters at Baramoola; and, 4 miles below Moozufferabad, it receives the Kishungunga from the N.; its course thus far being nearly W. From this it takes a great curve southwards to the town of Jhylum, where, in the middle of October, it was found to be 150 yards wide and from 12 to 16 feet deep. In its course through the hills this river is very rapid, and from 100 to 200 yards broad. It is not fordable at any season, though in many places nearly so, as men and horses cross with ease, having only 15 or 20 yards to swim. After a course of 450 miles, it joins the Chunab at Trimmoo Ghat, 18 miles below Jhung, and 45 above Moultan, in which it loses its name. These joint streams, called the Chunab or Chunha, receive the Ravee 48 miles lower down, near Fazilshah and Ahmedpoor, from the eastward, and pass 4 miles N. of Moultan, retaining the name of Chunab to within 7 miles of Ooch, where they are joined at Sheencebukree by the Gharra, or joint streams of the Beyah and Sutledj, 65 miles below Moultan, and 40 miles below Buhawulpore. From this point to Mittenda Khot, where they fall into the Indus, about 76 miles, these five streams take the name of the Punnud. The Indus and the Punnud, or the five rivers, run parallel to each other for this distance, which is about 10½ miles. The whole of this space is one complete sheet of water during the rains and hot season, and appears as one river. The greatest breadth between the Jhylum and the Indus appears to be 114 miles from Attock to Jelalapore Ghat. The whole course of the Jhylum, including its windings, may be estimated to exceed 450 miles.