<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>
where does the thames river start and end in ontario
from the Town of Tavistock westward through the cities of Woodstock , London and Chatham to Lighthouse Cove on Lake St. Clair