This map shows navigable routes to the mines of the southeastern Brazilian state of Minas Gerais. During the 18th century, when this map was drawn, the region’s gold and diamond mines attracted thousands of prospectors. The Portuguese crown financed the construction of a road through the mining regions, from Rio de Janeiro to the diamond center, Diamantina, and strictly controlled traffic on the road. The region was also accessible via the São Francisco River, which begins in Minas Gerais. Brazil -- History -- Colonial Period, 1500-1822; Colonial expeditions; Rivers; São Francisco River; Tracks; Trails