The Tatshenshini—known as the Tat to its growing group of aficionados—has been called America's wildest river. The reference isn't to the rapids (most of the time, the water slides along at a controlled rollick); but to the surrounding country. There are no towns, roads or bridges between the put-in at the Yukon's Dalton Post and the take-out 180 miles downstream at Dry Bay in Alaska. The Tatshenshini and the Alsek are major migratory corridors for bears and moose traveling from interior Yukon and British Columbia to the Gulf of Alaska.