Iceberg A23a measures 40 by 32 nautical miles, according to the U.S. National Ice Center. For comparison, Hawaii's island of Oahu is 44 miles long and 30 miles across .

Iceberg A23a measures 40 by 32 nautical miles, according to the U.S. National Ice Center. For comparison, Hawaii's island of Oahu is 44 miles long and 30 miles across .

"It's a trillion tons of ice," as one expert told NPR. Now the largest iceberg in the world, A23a, is on the move after decades of being grounded on the seafloor.

The world's largest iceberg, A23a, is moving into the open waters near Antarctica after being essentially stuck in place for decades. It's seen here in satellite imagery from Nov. 15.

"Large icebergs bump into the shoals around South Georgia more or less every year - it's a kind of highway for the major ...

While B-22A is a large iceberg, it isn't anywhere near the largest one ever recorded. That record is held by an iceberg called B-15, which measured a massive 4,247 square miles, ...

A huge iceberg has run aground just off the coast of Newfoundland in Canada. For now, it's made a home in what is known as "iceberg alley," and in photos, appears to dwarf the houses in town.

"It's a trillion tons of ice," as one expert told NPR. Now the largest iceberg in the world, A23a, is on the move after decades of being grounded on the seafloor.

Iceberg A23a measures 40 by 32 nautical miles, according to the U.S. National Ice Center. For comparison, Hawaii's island of Oahu is 44 miles long and 30 miles across .

"It's a trillion tons of ice," as one expert told NPR. Now the largest iceberg in the world, A23a, is on the move after decades of being grounded on the seafloor.