Puits de Jacob
The spring is located on the property of Jacob's Well Natural Area (JWNA), managed by the Hays County Parks Department. The visitor entrance for JWNA is located at 1699 Mt. Sharp Road, Wimberley, TX 78676. The diameter mouth of the spring serves as a popular local swimming spot. From the opening in the creek bed, Jacob's Well cave descends vertically for about , then continues downward at an angle through a series of silted chambers separated by narrow restrictions, finally reaching an average depth of . Until the modern era, the Trinity Aquifer-fed natural artesian spring gushed water from the mouth of the cave, with a measured flow in 1924 of , discharging into the air.