THE NORTHERN PLAINS 
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INDIA‘ DHYSICAL AND POLITICAL. 
A fourth railway from Lahore leads southward to Karachi, the 
natural port for the Punjab products, and which possesses an excellent 
harbour. 
THE PLAIN OF THE GANGES. 
The Ganges has a course of about 1,500 miles, and is navigable 
almost from the base of the Himalayas. Its chief tributary is the 
Jumna, and the district between these two rivers is intersected by canals 
supplied with water drawn from their upper courses. Some of these 
canals are used for navigation as well as irrigation. Many wells also have 
been sunk in the United Provinces for the sake of irrigation ; but the 
heavier rainfall of Bengal renders irrigation less necessary there.