For today's Geo Quiz, we're heading to the Ocean of Storms. Two American adventurers arrived in the Ocean of Storms 39 years ago today.

And it wasn't an easy place to reach. The journey took four days. One of the explorers, Pete Conrad, even managed to get around on the Ocean - without a vessel.

Pete Conrad

"I can walk okay," he said, "but I've got to take it easy."

Once he'd taken a good look at the Ocean of Storms, Conrad and his colleague Alan Bean returned to their ship, the Yankee Clipper.

So - where is this strange Ocean of Storms?

The answer's coming up...