There are two Sydenham Rivers in Ontario. * The Sydenham River (Lake Huron) flows north from Williams Lake and falls over the Niagara Escarpment, through the city of Owen Sound and into Georgian Bay. * The Sydenham River (Lake Saint Clair) flows west and south from near London, emptying into Lake St. Clair at Wallaceburg.This article includes a list of related items that share the same name (or similar names). If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article.