This 2.5-million-acre preserve protects a 128-mile stretch of the Yukon River between Eagle and Circle — a corridor rich in Klondike gold rush history, with abandoned roadhouses, cabins, and the wrecks of sternwheelers — along with the entire undeveloped watershed of the wild Charley River. The preserve hosts the highest density of nesting peregrine falcons in Alaska and is reached only by boat, plane, or winter sled.