2 B31-wikimedia commons.jpg

Wikimedia Commons/Public Domain

B-31 is about six times the size of Manhattan, making it one of the largest on the planet. It is 255 square miles long and 1,640 feet thick. NASA has been tracking what is more like ice-island since it separated from the front of Antarctica’s Pine Island Glacier in November 2013. NASA says B-31 “has been thinning and draining rapidly and may be one of the largest contributors to sea level rise.”