Yedoma River (IMAGE) University of Colorado at Boulder Caption This is a general view of a 35-meter-high riverbank exposure of the ice-rich syngenetic permafrost (yedoma) containing large ice wedges along the Itkillik River in northern Alaska. Credit Photo courtesy Mikhail Kanevskiy; University of Alaska Fairbanks, Institute of Northern Engineering Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.