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.

The oldest and largest iceberg on Earth landed on a sub-Antarctic island belonging to Britain Tuesday. According to the British Antarctic Survey research organization, the mass known as A23a has stopped drifting and run aground on South Georgia,

The biggest iceberg in the world, named A23a, appears to have run aground after drifting around the Southern Ocean near Antarctica since 2020.