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watershed (n.)
"line separating waters flowing into different rivers," 1803, from water (n.1) + shed in a topographical sense of "ridge of high ground between two valleys or lower ground, a divide," perhaps from shed (v.) in its extended noun sense of "the part of the hair of the head" (14c.). Perhaps a loan-translation of German Wasser-scheide. Figurative sense is attested from 1878. Meaning "ground of a river system" is from 1878.
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divide (n.)

1640s, "act of dividing," from divide (v.). Meaning "watershed, separation between river valleys" is recorded by 1807, American English.

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Delhi 
city in India, of unknown origin, perhaps connected to Hindi dehli "threshold," with reference to the watershed boundary between the Ganges and Indus, which is nearby.
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