<Tr> <Td_colspan="2"> Location of the mouth of the Thames River in southern Ontario </Td> </Tr> <P> The Thames River is located in southwestern Ontario, Canada . </P> <P> The Thames flows west 273 kilometres (170 mi) through southwestern Ontario, from the Town of Tavistock westward through the cities of Woodstock, London and Chatham to Lighthouse Cove on Lake St. Clair . Its drainage basin is 5,825 square kilometres (2,249 sq mi). </P> <P> Called Askunessippi (Anishinaabe language: Eshkani - ziibi, "the antlered river") by the Odawa and Ojibwa inhabitants, who together with the Neutrals have lived in the area since before Europeans arrived, the river was named after the River Thames in England by Lieutenant Governor John Graves Simcoe in 1793 . </P>

Where does the thames river start and end in ontario