SS Keewatin is a passenger liner that once sailed between Port Arthur / Fort William (now Thunder Bay) on Lake Superior and Port McNicoll on Georgian Bay (Lake Huron) in Ontario, Canada. She carried passengers between these ports for the Canadian Pacific Railway's Great Lakes Steamship Service. The Keewatin also carried packaged freight goods for the railway at these ports.Built by Fairfield Shipbuilding and Engineering Company in Scotland as Hull No.