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] falls into the Ganges at Allahabad. North of Mathr'a Delhi is the only important town on its banks. The Jamna is crossed by railway bridges between Delhi and Meerut and between Ambala and Saharanpur.

Changes in Rivers.— Allusion has already been made to the changes which the courses of Panjab rivers are subject to in the plains. The Indus below Kalabagh once ran through the heart of what is now the Thai desert. We know that in 1245 a.d. Multan was in the Sind Sagar Doab between the Indus and the united streams of the Jhelam, Chenab, and Ravi. The Bias had then no connection with the Sutlej, but ran in a bed of its own easily to be traced to-day in the Montgomery and Multan districts, and joined the Indus between Multan and Uch. The Sutlej was still flowing in the Hakra bed. Indeed its junction with the Bias near Harike, which probably led to a complete change in the course of the Bias, seems only to have taken place within the last 150 years