Afternoon: Lagunas Miscanti and Miñiques
From Socaire the road climbs again, swinging east and upward into the altiplano. The altitude crosses 4,000 metres before the lagoons appear — arriving abruptly at a bend, as several accounts note, with the first view of Lagunas Miscanti and the dark mass of Cerro Miscanti (5,622 metres) behind it. Miscanti is the larger of the two lakes, a brackish arrowhead of intense turquoise covering 13.5 square kilometres; Miñiques lies three kilometres further, separated from its sister by a Pleistocene lava flow that split what was once a single waterbody. Cerro Miñiques (5,910 metres) looms over the smaller lake; Miscanti Hill, considered sacred by the Socaire community and closed to outsiders, rises to the northeast. The marked trail from the entrance follows rock-lined paths of about 800 metres along Miscanti's shore before continuing to Miñiques — a three-kilometre out-and-back in total, taking around an hour at altitude. Vicuñas wander the ichu grass along the margins; horned coots nest in the shallows; the silence is the silence of high places. Take warm layers — the wind comes quickly up here, and the temperature drops well before the light does. The reserve is open until 6 pm.
Return to San Pedro de Atacama
The return follows the Ruta 23 north in its entirety, the long descent back through the Atacama basin and into San Pedro de Atacama in the early evening. The day has covered roughly 250 kilometres in a loop and passed through three distinct altitudinal zones — salt flat, mid-desert reserve, high altiplano — and the town, when it reappears, will feel more like a village than it did in the morning.