The deepest cave of the US is part an extensive system caves southwestern state what name this caves?

Lechuguilla Cave is the deepest known cave in the United States. It is located in the Guadalupe Mountains National Park in New Mexico. The cave was discovered in 1986 and has since been extensively explored by cavers. Lechuguilla Cave is a complex system of passages, chambers, and domes. The cave is home to a variety of unique and rare cave formations, including gypsum flowers, popcorn, and helictites. Lechuguilla Cave is also home to a number of endangered species, including the Lechuguilla Cave salamander and the Tooth Cave pseudoscorpion.