the Pacific Ocean, in or near San Francisco Bay. Then, when Manuel Augustin Mascaro and Miguel Constanso made the first map of the whole Viceroyalty of New Spain (1784), they extended the "San Felipe" almost to the Sevier Lake. A similar map was published in 1820 by Sidney E. Morse showing the Rio de San Buenaventura flowing into a lake, the western limits of which are unknown. This map shows the "Supposed river between the Buenaventura and the Bay of Francisco, which will probably be the communication between the Atlantic and the Pacific" toward this lake, but quite not connecting with it. A map by J. Finlayson (1822) shows a Rio de S. Buenaventura originating near the " source of the Rio Colorado" and emptying into a salt lake the western limits of which "are unknown". This same map indicates that an uncharted Rio de San Filipe crosses a range of mountains at 122 degrees west longitude. Other cartographers began to boldly assert that rivers flowed from Lake Timpanogos and "Lac Salado" to the Pacific Ocean. Henry S. Tanner's influential map of 1822 shows the Buenaventura River flowing from the north central Rockies through the Sevier Lake to the Pacific Ocean south of Monterey Bay. This map also shows two rivers flowing from Lake Timpanogos, (Utah Lake) one to San Francisco Bay (the R. Timpanogos), the other to Port Orford, Oregon (the Los Mongos R.) where the Rogue River enters the Pacific. A similar map by Anthony Finley was published in 1826 A map by Thomas Bradford (1835) shows a river flowing to San Francisco Bay (labeled as "Port Sir Francis Drake" in a region Bradford called "New Albion") from the south end of Lake Timpanogos. There is no reference to Rio de San Buenaventura. An 1844 map by James Bowden shows a landlocked Buenaventura wrapping around the southeast side of a "doubtful" Lake Timpanogos. Explorations to find the Buenaventura The Great Salt Lake (GSL) was first seen and reported as very saline by white North Americans in 1824, apparently independently by Jim Bridger and Etienne Provost. Upon learning of the GSL, explorers began equating Lake Timpanogos on the maps with it and, apparently unaware of the fact that saline lakes such as the Great Salt and Sevier Lakes have no outlets, began efforts to find the rivers flowing from them west to the Pacific as promised by maps such