Alamo Heights, United States of America
San Antonio Springs (also known as the Blue Hole) is a cluster of springs in Bexar County, Texas. These springs provide a large portion of the water for the San Antonio River, which flows from San Antonio to the Gulf of Mexico. The San Pedro Springs also feed into the San Antonio River.
Listen to the audio guide for Blue Hole Free on WIP — starts by itself when you arrive, even with the screen off