The Devil’s Sinkhole is home to one of Texas’ largest colonies of Mexican free-tailed bats and is a National Natural Landmark. 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.

Devil's Sinkhole State Natural Area is a natural bat habitat near the city of Rocksprings in Edwards County in the U.S. state of Texas. Carved by water erosion, the cavern is home to several million Mexican free-tailed bats that emerge at sunset during April through October.

About 3 million Mexican free-tailed bats inhabit the sinkhole seasonally, from May through October. These small, flying mammals put on quite a show in the evenings, forming a “tornado of bats” as they leave the cave to forage.

Three to four thousand cave swallows live in the cave at night while the bats are gone. Portions of the cave are below the water table. Because of this, several freshwater lakes lie around the cave’s perimeter. These lakes support two unique crustaceans: a native …

Devil's Sinkhole does not have camping. All access to the park is through guided tours. Contact Devil's Sinkhole Society at 830-683-2287 or visit the Rocksprings customers Center.

Jan 20, 2011 · A registered National Natural Landmark since 1985, the sinkhole plunges a remarkable 400 feet and has a 40-foot by 60-foot opening. It is the largest single-chambered cavern and the...

Oct 23, 2024 · The Devil's Sinkhole, northeast of Rocksprings in Edwards County, is thought to be the largest single-chamber cavern in Texas. It was named in 1876 by the wives of Ammon Billings and other men who had discovered the entrance after an encounter with Indians.

Oct 3, 2017 · Almost a million years ago, water fell from the sky and sank into the ground, where it picked up minerals, slightly acidifying it. This acidic water ate away at the delicate limestone of the Edwards Plateau. Over time, it created a vast hole in the rock.

The Devils Sinkhole is the largest single chamber cavern in the state of Texas and third deepest measuring over 350 feet deep. The cave is home to 1 to 4 million Mexican-Free tail bats during the summer and they emerge each evening to fly to agricultural areas to the east and southeast were they feast on insects, mostly moths & agricultural pest."

The Devil's Sinkhole Society now offers Evening Bat Flight tours throughout the summer and Guided Nature hikes on the first and third Saturdays of every month except during hunting season. Day tours can be arranged with a minimum of three days notice.