1848 Map of Oregon and Upper California From the Surveys of John Charles Fremont and other Authorities

This map of the American West is one of the most highly respected of its time, despite Fremont’s famous topographical error showing an east-west mountain range across the unexplored area of the Great Basin. The map was changed over time, with this one concentrating on California, but also including parts of present-day Arizona and Utah. Most topographical renderings are quite accurate, and this map is considered the most important nineteenth-century map of the area. The El Dorado or Gold Regions are shown on the south fork of the American River and the upper course of the Feather River.