Steer 300 miles south of Hanoi for today's Geo Quiz. The place in Vietnam we're looking for is a national park.
It's located in north-central Vietnam in Quang Binh Province. The park is mostly jungle. But it offers tourists a lot to explore UNDERGROUND.
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There are as many as 300 limestone caves and grottoes -- one of the world's longest underground rivers -- and curious rock formations deep in the ground.
The geological features prompted UNESCO to designate the park a "World Heritage Site" in 2003.
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Just last month, a team of British and Vietnamese explorers visited what they say is the largest cave passage anywhere.
"And they says its like a huge underground cathedral."
So what's the name of this Vietnamese national park?
