Below is an article "Wasson's Landslide: the most notorious rapid in the Grand Canyon of the Amazon", written by Rocky Contos and published in the May/Jun 2016 issue of American Whitewater.

for info on upcoming trips on the Grand Canyon of the Amazon, see www.SierraRios.org

You might also be interested in reading John Wasson's initial article about the Marañón: First Down the Marañon. South American Explorer #2, 1978; by John Wasson. [permission to reprint given by John Wasson]