A giant pumice raft has been found floating in the ocean.
The rock raft is about the same size as 20,000 football fields – bigger than Wellington!
Scientists think the rock raft came from an underwater volcano near Tonga, which erupted earlier this month.
Pumice is a type of volcanic rock. It is very lightweight, meaning it can float on water. Pumice is made when magma from a volcano cools really quickly in water.
The rock raft is made up of trillions of tiny pieces of pumice stone, so it looks like a floating island when they’re all together.
Experts think the pumice will be good for the environment, providing homes for ocean creatures, and even helping to restore the Great Barrier Reef in Australia.