Laguna 69 is an electric-turquoise lake at 4,604 metres, held in a rock bowl directly beneath the ice of Chacraraju. A thin waterfall comes down the headwall from that 6,108-metre glacier and feeds the lake through the thaw, and snow peaks — Chacraraju, Pisco and Yanapaccha — close the basin on every side. The colour is rock flour: ice upstream grinds stone into a powder fine enough to hang in the meltwater and scatter light back as turquoise, deepening toward blue as the sun climbs. All of it lies in the Cordillera Blanca, the highest tropical mountain range on Earth, inside Huascarán National Park and a UNESCO World Heritage Site. The odd name is bureaucratic: when the park was created in 1975 the lakes with no traditional Quechua name were simply numbered, and this one drew the sixty-ninth slot.
Reaching it is the point as much as the view. The trail starts at Cebollapampa, around 3,900 metres in the Llanganuco valley, and climbs some seven hundred metres over seven kilometres — roughly three hours up and two back down. At this altitude every breath comes short and the last climb is slow work; then the ground drops away and the lake appears, an electric-blue sheet held in a bowl of ice. You hear the glacier crack and the waterfall hiss, and little else in the thin air. Since 2026 you can no longer walk in alone: access runs only through tour operators licensed by SERNANP, the park authority. Close to forty-five thousand people walked up in 2025, and more of them came from abroad than from Peru.