The A23a iceberg is twice the size of Greater London, and slightly smaller than the State of Rhode Island The world’s largest iceberg has run aground off the coast of a remote island in the Atlantic Ocean,

A23a weighs nearly a trillion metric tons, making it the world’s largest active iceberg. It calved from Antarctica in 1986, making it the world’s oldest berg. And now, after drifting for half a decade, A23a has grounded itself about 56 miles (90 kilometers) south of South Georgia.