The River Westbourne is a river in London, England. It flows from Hampstead down through Hyde Park to Sloane Square and into the River Thames at Chelsea. The river was originally called the Kilburn (Cye Bourne — royal stream, 'Bourne' being an Anglo-Saxon word for 'river') but has been known, at different times and in different places, as Kelebourne, Kilburn, Bayswater, Bayswater River, Bayswater Rivulet, Serpentine River, The Bourne, Westburn Brook, the Ranelagh River and, the Ranelagh Sewer. It is of similar size to the Fleet.
The River Westbourne rose in Hampstead and flowed south through Kilburn. Kilburn was the name of the river at that point. It ran west along what is now Kilburn Park Road and then south along what is now Shirland Road. After crossing what is now Bishops Bridge Road, the river continued more or less due south, between what is now Craven Terrace and what is now Gloucester Terrace. At this point, the river was known until the early nineteenth century as the Bayswater rivulet and from that it gave its name to the area now known as Bayswater.
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