Yukon-Charley Rivers National Preserve, 2,526,512 acres (1,022,879 hectares), E central Alaska. The preserve, which protects the two river basins, near the Canadian border, contains paleontological and archeological sites, as well as old cabins and relics from the gold rush of 1898. Proclaimed a national monument in 1978, it was designated a national preserve in 1980. The 88-mi (142-km) Charley Wild River, authorized in 1980, lies entirely within the preserve. See National Parks and Monuments (table).