Our Geo Quiz today takes us down to the water's edge.

The body of water we're looking for today is a part of the South China Sea that's off the northeastern coast of Vietnam. It lies about 100 miles south of the Chinese border.

And it marks the place where Jon Bowermaster began an 800-mile long sea kayak expedition:

“The waters are very, very green and surround these 350 tall, limestone islands that jut out of the sea. The difficult thing for us of course is there's no beaches there so we had to camp on a small boat as we moved through the bay.”

There are floating villages scattered throughout this bay, scenic caves, even monkeys. And it's a UNESCO World Natural Heritage Site.

We'll hear more about Vietnam as seen from a sea kayak here...