1 Iceberg B-15-wikimedia commons.jpg

Wikimedia Commons/Public Domain

This was the largest iceberg ever measured. It originated from the Ross Ice Shelf in Antarctica, and was a whopping 170 miles (270 kilometers) long and 25 miles (40 km) wide – nearly the size of Connecticut, larger than the island of Jamaica. Over time, the iceberg broke into smaller pieces, according to Live Science, which can still be seen around the virtually uninhabited ice-covered landmass.