In 1798, this theory was confirmed when Bass and Flinders, in the sloop "Norfolk", circumnavigated Van Diemen's Land. In the course of this voyage Bass visited the estuary of the Derwent River, found and named by Captain John Hayes in 1793, where the city of Hobart would be founded on the strength of his report in 1803. When the two returned to Sydney, Flinders recommended to Governor John Hunter that the passage between Van Diemen's Land and the mainland be called Bass Strait.