Here is the question :
WHERE CAN YOU EXPLORE THIS UNDERGROUND RIVER?
Here is the option for the question :
Palawan, The Philippines
Ko Mak, Thailand
Nusa Penida, Indonesia
And, the answer for the the question : ‘Where can you explore this underground river?’ is
ANSWER : PALAWAN, THE PHILIPPINES
The expedition to Puerto Princesa Subterranean River National Park is about 47 miles from Palawan’s capital, but it is well worth the trek. The national park, a UNESCO World Heritage Site, has spectacular cave systems rising over the navigable underground river. At just over five miles long, the subterranean park may be explored by paddleboat, with caves on either side exhibiting limestone karst landscapes, preserved old-growth forests, and a full mountain-to-sea ecosystem that provides a rich habitat for biodiversity protection.