Alaska's Koyukuk River was the site of an interesting discovery. During a float down the river, a group of University of Virginia professors spotted a woolly mammoth tusk along the riverbank.

See trip details for float the Tatshenshini-Alsek River in Alaska, one of 100 best American adventure trips from National Geographic. August 2, 2010 • 2 min read ...

A 25-year-old New Stuyahok woman found dead in a skiff Sunday is believed to have died from exposure or hypothermia, Alaska State Troopers said.