Agua Caliente

## Overview Agua Caliente is a natural hot spring located in the municipality of Rosario de Tesopaco in the state of Sonora, Mexico. True to its name — "Agua Caliente" meaning "Hot Water" in Spanish — this remote spring features a flow of thermal water alongside a separate flow of ice-cold water just a few meters away. This striking contrast between hot and cold water sources in such close proximity makes it a unique and memorable destination for hot spring enthusiasts exploring the rugged landscapes of southern Sonora. The spring sits near the road between Hornos and Tesopaco, in a region known for its arid terrain, dramatic canyons, and geothermal activity. The area's thermal waters are likely fed by deep geological fractures that allow groundwater to be heated by the earth's interior before rising to the surface — a common feature in Sonora's volcanic and tectonically active zones. ## Directions 1. Head toward the town of Rosario de Tesopaco in southern Sonora, Mexico. 2. Follow the road that connects **Hornos** to **Tesopaco** (sometimes referred to locally as the Hornos–Tesopaco road). 3. The hot spring is located along or near this road at approximately **GPS coordinates: 27.73194, -109.83683**. 4. Look for the thermal water flow — the cold water source is just a few meters away. *Note: This is a remote area with limited signage. A vehicle with good clearance is recommended, and it's advisable to have offline GPS or downloaded maps available, as cell service may be unreliable in this part of Sonora.* ## What to Expect Visitors will find two distinct water flows in close proximity: one of warm thermal water and another of notably cold water. This natural pairing offers a rare opportunity to experience both extremes within steps of each other. The surrounding landscape is characteristic of rural Sonora — dry, rugged, and sparsely populated, with sweeping desert views. As this is a free, undeveloped hot spring, there are no facilities, changing rooms, or services on-site. Visitors should come prepared with their own water, supplies, and sun protection. The area is remote, so plan accordingly and let someone know your travel plans. Road conditions may vary by season, particularly during the summer monsoon rains (July–September), which can make unpaved roads difficult to navigate. The thermal water has historically been enjoyed by locals, but no formal water quality testing data is publicly available. As with any natural hot spring, water temperatures and conditions can vary.