A neon landscape at the hottest inhabited place on Earth
Dallol
In Ethiopia's Danakil Depression, sulfur springs paint the ground acid yellow and green while average temperatures make Dallol the hottest permanently inhabited settlement on the planet.
Dallol sits in Ethiopia's Danakil Depression, a scorched basin roughly 130 meters below sea level that holds the record for the highest average annual temperature of any permanently inhabited place on Earth, with historical records showing average temperatures well above 34 degrees Celsius year round and daytime highs that regularly exceed 45 degrees Celsius. The extreme heat is only part of what makes Dallol so surreal. Its landscape is dominated by hydrothermal fields where sulfur, iron oxide, and salt deposits create vividly colored pools and mineral formations in shocking shades of yellow, green, and orange, the product of volcanic activity interacting with vast underground salt deposits left behind by an ancient sea. Despite the brutal conditions, the region has long been worked by the Afar people, who mine salt from the surrounding Danakil plains and transport it by camel caravan across the desert, a trade that continues largely unchanged for generations despite temperatures that make Dallol effectively uninhabitable for extended stays. Today Dallol itself functions more as a striking geological attraction and mining outpost than a conventional town, drawing scientists studying extremophile life and tourists chasing one of the most alien landscapes on the planet.
Record breaking heat
Weather data collected at Dallol between 1960 and 1966 recorded an average annual temperature of about 34.4 degrees Celsius, the highest ever documented for a permanently inhabited location, though the settlement today is more of a mining outpost than a conventional town with year-round residents. Daytime temperatures can climb past 45 degrees Celsius, and the combination of heat, low elevation, and dry desert air makes it one of the most physically punishing environments on Earth.
A landscape shaped by volcanoes and salt
Dallol lies atop an active volcanic system where magma close to the surface heats groundwater that has dissolved through thick layers of ancient salt, left behind when a sea that once covered the Danakil Depression evaporated millions of years ago. This combination produces hydrothermal springs rich in sulfur, iron, and various salts, which crystallize on the surface into extraordinary formations of neon yellow, acid green, and rust orange, giving the area an almost extraterrestrial appearance.
The salt trade of the Afar
For centuries, the Afar people have mined salt slabs from the flat plains surrounding Dallol, cutting them by hand into uniform blocks that are loaded onto camel caravans and transported across the desert to markets, a practice that continues today largely unchanged despite the extreme heat. This grueling trade has sustained communities in the region for generations, even as the immediate area around the hydrothermal field itself remains essentially unlivable long term.
A magnet for scientists and tourists
Because Dallol's acidic, super-heated pools host unusual microbial life forms known as extremophiles, scientists have studied the area as an analog for environments on other planets, including early Mars. In recent years, growing numbers of tourists have also made the difficult journey into the Danakil Depression to see the surreal colors up close, despite the challenging logistics, extreme heat, and the region's history of political instability and occasional security incidents.
Fun facts
- Dallol holds the record for highest average annual temperature of any inhabited place, around 34.4 degrees Celsius.
- Its colorful terrain comes from sulfur, iron, and salt deposits interacting with volcanic heat.
- The Danakil Depression sits about 130 meters below sea level.
- Afar salt miners still cut and transport salt slabs by camel caravan today.
- Scientists study Dallol's extreme microbial life as an analog for potential life on Mars.
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Text on this page is original Terralocate editorial. Background facts compiled from the public sources listed above. Images via Wikimedia Commons under their respective licenses (typically CC BY-SA or public domain).