Erta Ale is a shield volcano at 613 metres above sea level — low by volcanic standards, but sitting above a vast plain far below sea level, so it dominates the landscape in every direction. What makes it extraordinary is the lava lake in its summit caldera: a pool of molten rock that has been bubbling, churning, and occasionally overflowing continuously since at least the early 20th century, one of only five permanent lava lakes in the world.
The ascent to the crater takes four to five hours on foot, starting after sunset to avoid the worst heat and arriving at the rim around midnight. The lava lake is viewed at night, when the glow is most vivid: orange-red light pulsing from the caldron below, plumes of sulphurous gas drifting across the rim, and a soundscape of pops, crackles, and low rumbles as the surface of the lava churns and breaks. The experience is genuinely geological — you are standing on the surface of the planet watching its interior in motion. Guides maintain a safe viewing distance from the rim; the volcanic activity is real and unpredictable. Tours spend the night at a simple camp on the volcano's flank and return to base the following morning.