Iceberg B-46 is a large piece of ice that separated from Pine Island Glacier in Antarctica in October 2018. At its largest size, it measured 225 kilometers across. Scientists first spotted the iceberg using the Landsat 8 satellite, and later took pictures of it with a NASA DC-8 plane as part of the IceBridge mission.

In the past, Pine Island Glacier typically released icebergs about once every six years. However, this event now happens almost every year.