The river flows north from a source near Williamsford (Williams Lake), drops over the Niagara Escarpment at Inglis Falls and empties into Owen Sound harbour on Georgian Bay.
It was named after Lord Sydenham, governor of Canada from 1839 to 1841.
At this dam is a fish ladder that allows Chinook Salmon and Rainbow Trout to complete their spawning migrations in this river.
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