page_title: River Thames
section_title: Sailing
hierarchical_section_title: River Thames / Sport / Sailing
caption_attribution_description: English: Thames Raters at Raven's Ait on the River Thames
context_page_description: The River Thames, known alternatively in parts as the Isis, is a river that flows through southern England including London. At 215 miles, it is the longest river entirely in England and the second-longest in the United Kingdom, after the River Severn.
  It flows through Oxford, Reading, Henley-on-Thames and Windsor. The lower reaches of the river are called the Tideway, derived from its long tidal reach up to Teddington Lock. It rises at Thames Head in Gloucestershire, and flows into the North Sea via the Thames Estuary. The Thames drains the whole of Greater London.
  Its tidal section, reaching up to Teddington Lock, includes most of its London stretch and has a rise and fall of 23 feet. Running through some of the driest parts of mainland Britain and heavily abstracted for drinking water, the Thames' discharge is low considering its length and breadth: the Severn has a discharge almost twice as large on average despite having a smaller drainage basin. In Scotland, the Tay achieves more than double the Thames' average discharge from a drainage basin that is 60% smaller.
  Along its course are 45 navigation locks with accompanying weirs.
context_section_description: Sailing is practised on both the tidal and non-tidal reaches of the river. The highest club upstream is at Oxford. The most popular sailing craft used on the Thames are lasers, GP14s and Wayfarers. One sailing boat unique to the Thames is the Thames Rater, which is sailed around Raven's Ait.
caption: Thames Raters at Raven's Ait, Surbiton
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