Introduction
A-23A is the world’s largest iceberg. It broke off Antarctica in 1986, then stayed stuck for more than 30 years.
Size and Scale
A-23A covers about 4,000 square kilometers. That’s larger than Rhode Island. It stands about 400 meters thick.
Why It Was Stuck
After breaking free, the berg grounded itself in the Weddell Sea. Its massive base dug into the seafloor, keeping it in place for decades.
A New Journey
In 2023 it finally started drifting again. Winds and currents pushed it back into open water.
Where It’s Heading
A-23A is moving toward the Antarctic Circumpolar Current, the main highway that carries icebergs toward the South Atlantic.
Why It Matters
The berg can change marine traffic routes, disturb wildlife, and deliver fresh water and nutrients as it melts.
Scientists Are Watching
Researchers track A-23A by satellite. Its melt rate and drift path help improve climate and ocean models.