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San Antonio, Texas
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The Blue Hole is a natural artesian spring located on the campus of the University of the Incarnate Word, and it is considered the source of the San Antonio River.
The spring was a sacred site for the Payaya people, who were the original inhabitants of the San Antonio area.
The Blue Hole is situated within the Headwaters Sanctuary, a 53-acre nature preserve dedicated to conservation and education.
The Headwaters at Incarnate Word organization works to protect the spring and its ecosystem, offering educational programs and volunteer opportunities.
Over the years, the spring's flow has diminished due to increased urbanization and water usage in the San Antonio area.