If A23a, an Antarctic iceberg the size of Rhode Island, grounds off South Georgia Island, it will create a hazard for wildlife and ships alike.

Environmentalists fear for the island's rare king penguins and millions of elephant and fur seals if iceberg collides.

World's largest iceberg, A23a, is drifting towards the British island of South Georgia. A23a has been monitored for 30 years, since it first calved from Filchner ice shelf in Antarctica.