The Westbourne or Kilburn is a mainly re-diverted small River Thames tributary in London, primarily sourced from Whitestone Pond, Hampstead Heath and which, notwithstanding one main meander, flows southward through Kilburn and the Bayswater to skirt underneath the east of Hyde Park's Serpentine lake then through central Chelsea under Sloane Square and it passes centrally under the south side of Royal Hospital Chelsea's Ranelagh Gardens before historically discharging into the Inner London Tideway. Since the latter 19th century its narrow basin has been further narrowed by corollary surface water drains and its main flow has been replaced with a combined sewer beneath its route.
The river was originally called the Kilburn 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.
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Kensington and Chelsea