Las Estacas Natural Reserve and Spa (Spanish: Balneario Las Estacas) is a mineral spring, day spa and natural reserve located in the town of Tlaltizapan, in the state of Morelos, Mexico. The natural reserve is a protected area for plants and wildlife since 1998; the protected area has 652.17 hectares (1,611.5 acres)[1] and harbors a first magnitude spring with a flow rate of 6,700 L/s.[2]