Farther west in the Punjab region, the 130-mile long "Hasli Canal", had been constructed by previous rulers. Taking off from the Ravi river and supplying water to the cities of Lahore and Amritsar, this left-bank canal was extended by the British in the "Bari Doab Canal" works during 1850–1857. The Punjab region, moreover, had much rudimentary irrigation by "inundation canals". Consisting of open cuts on the side of a river and involving no regulation, the inundation canals had been used in both the Punjab and Sindh for many centuries. The energetic administrations of the Sikh and Pathan governors of Mughal West Punjab had ensured that many such canals in Multan, Dera Ghazi Khan, and Muzaffargarh were still working efficiently at the time of the British annexation of the Punjab in 1849–1856 (period of tenure of the Marquess of Dalhousie Governor General).