A Triple Junction Cauldron
The Danakil Depression is a geological site at the Afar Triple Junction, a point where the African, Somali, and Arabian tectonic plates are actively pulling apart. This relentless stretching thins the Earth's crust, causing the land to sink to more than 120 meters below sea level. A shallow magma chamber heats groundwater that rises to the surface, dissolving a thick layer of salt left by an ancient evaporated arm of the Red Sea.
When this superheated, pressurized brine emerges, it creates the Dallol hydrothermal system—a region of otherworldly springs and pools. The water can be near-boiling, with temperatures recorded over 100°C (212°F). The pools are also extraordinarily acidic, with some reaching a pH value of 0, making them some of the most acidic naturally occurring waters on the planet. The bright colors are not biological. The brilliant yellows are created by high concentrations of sulfur, while copper salts produce turquoise greens, and iron oxides form rust-red and orange crusts. The air itself is often thick with toxic chlorine and sulfur vapors.