[November 20, 2014] Special Session on Extreme Geohazards at GEORisk 2014: A Special Session on Extreme Geohazards was organized at the GEORisk 2014 Conference in Madrid, Spain. Four presentations addressed the high risk associated with extreme volcanic eruptions and discussed options for improved monitoring and international governance for risk reduction. A panel discussion engaged the audience in developing ways to address the risk associated with low-probability high-impact events.