About Devil's Sinkhole State Natural Area
Some 3 million bats emerge in a swirling mass from the Devil’s Sinkhole in search of food on warm nights. Marvel at the amazing spectacle at this state natural area northwest of San Antonio. Access to Devil’s Sinkhole State Natural Area is only by guided tour. Reservations are required. All tours begin at the Devil’s Sinkhole Visitor Center in Rocksprings. A 50-foot wide shaft drops 140 feet into the cavern. The cavern itself has a diameter of over 320 feet and reaches 350 feet deep.