The U-Sea Colonsay is a bulk cargo carrier owned by Canpotex of Canada, primarily used for the transport of potash between Canada and destinations in Asia. The ship made its maiden voyage on October 2011 from Japan to Vancouver; it is named after the Colonsay Potash Mine in Province of Saskatchewan, where some of the potash it carries originates. This ship is one of nine vessels to be built for a joint venture operated by U-SEA and Canpotex. The vessel was built by Imabari Shipbuilding