The Danakil Depression — the sunken plain stretching northeast of Mekele toward the Eritrean and Djibouti borders — is one of the most extreme landscapes on earth, and Mekele is the primary jumping-off point for organised tours into it. At up to 125 metres below sea level, with temperatures regularly exceeding 50°C, this is among the lowest, hottest, and most geologically active places on the planet.
Most tours run three to four days and cover the main sites: the sulphurous, multicoloured hot springs of Dallol (acid pools of green, yellow, and red that look more like an alien planet than anything on earth), the salt flats of the Karum Lake where Afar camel caravans still harvest blocks of salt exactly as they have for centuries, and the lava lake at the summit of Erta Ale volcano. Erta Ale requires an overnight hike and is viewed at night, when the glow of the lava is most vivid. All tours must be arranged through a licensed operator and require an armed escort through the Afar region — not optional, and non-negotiable with local authorities.
Book through one of the established operators in Mekele well in advance, particularly in the October-March high season. The summer months (June-September) are extremely hot even by local standards and most tours do not run then.