NASA Snow Campaign Wraps 2020 Survey (IMAGE) NASA/Goddard Space Flight Center Caption Grand Mesa, Colorado is the world's largest mesa, or flat-topped mountain. With terrain ranging from open snow to thick forest, the mesa was a perfect place for the SnowEx 2020 team to test their instruments. Credit NASA / Jessica Merzdorf 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.