Lechuguilla Cave is located in the National Park, New Mexico. It is the 5th largest in the world (among those discovered yet), measuring 193 km long and 489 feet deep, making it the largest cave in the Americas....
Rivers, lakes, underground, underground rivers, underground lakes, Lechuguilla Cave, Carlsbad Caverns National Park
This underground lake is located near Macan Che, on the Yukatan Peninsula. It is one of many lakes considered by locals to be a gift from Mayans God and therefore is considered to be sacred....