[Answer] Where is the world's longest underground river?

Step 1 : Introduction to the question "Where is the world's longest underground river?"

...1. Philippines 2. Mexico 3. Colombia 4. New Zealand

Step 2 : Answer to the question "Where is the world's longest underground river?"

Mexico - Located in the Mexican state of Quintana Roo, the 198-mile-long Sac Actun cave system is one of the world’s longest known cave systems. Stretching 95 miles within that cave is the Sistema Sac Actun — the world’s longest subterranean river. “Sac Actun” translates literally to “white cave” in the Yucatec Mayan language, which is an apt name for this chalky-colored cave system and river. Sistema Sac Actun's reign as the world's longest underground river is relatively new: Prior to 2007, the Philippines' Puerto Princesa Subterranean River held the record. While 95 miles is a lot to cover underground, the river is no match for above-ground rivers like the Mighty Mississippi, which stretches for 2,350 miles.:

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