The vast high-altitude deserts of northern Chile and southwestern Bolivia — known as the Atacama and the Uyuni salt flats — rank among the world’s best locations for stargazing. Around the town of San Pedro de Atacama, clear skies, low humidity and minimal light and radio pollution create exceptional visibility of the Milky Way and other celestial features. That pristine environment has attracted several major observatories to the region, including the ALMA Observatory, one of the largest radio astronomy facilities in the world.
Buenos Aires–based tour operator Say Hueque specializes in customizable astronomy-focused expeditions that combine desert landscapes, cultural stops and off-road adventure. Their programs range from short, concentrated trips to extended overland journeys across Chile, Bolivia and northern Argentina. All departures are led by English-speaking guides experienced in high-altitude travel and desert conditions.
The six-day star-and-salt-flats itinerary is a compact option designed for travelers who want an intense but manageable experience. It typically includes three nights in San Pedro de Atacama to take advantage of prime stargazing conditions, followed by a three-day 4×4 crossing to the Uyuni salt flats in Bolivia. Accommodations on the 4WD segment are simple, shared mountain huts, and the schedule covers highlights such as Valle de la Luna (Moon Valley), the Tatio geyser field, extensive salt-flat panoramas and high-altitude lagoons. Daily breakfasts and most other meals are included.
For travelers seeking a longer expedition, Say Hueque offers extended programs that connect the Atacama and Uyuni with northern Argentina. A nine-day Salta–Atacama–Uyuni route explores the colonial city of Salta, the Andean altiplano, desert oases and the salt flats. A more comprehensive 16-day tour combines the north of Argentina, key Chilean desert sites and the Uyuni Salt Flats into a single overland journey, allowing more time for acclimatization, photography and deeper cultural encounters.
Beyond astronomy, these trips highlight the region’s dramatic geology and wildlife: expansive salt crusts and hexagonal patterns on the Uyuni flats, colorful highland lagoons that attract flamingos, steaming geothermal fields and surreal desert formations sculpted by wind and erosion. Travelers should plan for high elevations, strong sun and cold nights, and bring layered clothing, sun protection and reusable water bottles to stay comfortable and minimize environmental impact.
Whether you choose a short six-day adventure or a longer expedition across Argentina, Chile and Bolivia, these itineraries offer a mix of off-road exploration, natural wonders and world-class night skies ideal for photographers, amateur astronomers and anyone drawn to remote, unforgettable landscapes.