Hamilton Pool Preserve is a natural swimming hole located in Travis County, Texas, near Austin. It features a stunning waterfall that cascades into a turquoise pool, surrounded by limestone cliffs and lush vegetation. The preserve is a popular destination for hiking, swimming, and picnicking, attracting visitors year-round. The area was formed thousands of years ago when the roof of an underground river collapsed. Today, Hamilton Pool Preserve is part of the Balcones Canyonlands Preserve and is home to diverse wildlife and plant species. Visitors are encouraged to make reservations, as access is limited to protect the natural environment.