The Salar de Uyuni is one of those places that genuinely defies expectation. Stretching across roughly 10,500 square kilometres at an altitude of 3,656 metres on the Altiplano, it is the world's largest salt flat — and standing at its centre, with nothing but blinding white crust extending to every horizon, is a quietly overwhelming experience. The silence out there is almost physical.
Most travellers base themselves in the town of Uyuni, a small, dusty frontier settlement that serves almost entirely as a launch pad for tours. Three-day jeep circuits are the most popular option, typically taking in the salt flat itself, the surreal Isla Incahuasi with its giant cacti, the coloured lagoons of the Eduardo Avaroa Reserve, and the famous flamingo-dotted shores further south. Day tours exist but barely scratch the surface.
Book through a reputable agency in town — quality varies enormously, and cheaper often means older vehicles and less attentive guides.
The famous mirror effect, where a thin layer of water transforms the flat into a perfect reflection of the sky, occurs during the rainy season from December through April. It is spectacular, but the roads can become genuinely impassable and conditions shift quickly. The dry season, May to November, offers cleaner skies and better vehicle access, though no reflections.
Either way, the altitude will affect you — headaches and breathlessness are common, especially in the first day or two.
Dress in layers regardless of season, as temperatures swing dramatically between midday heat and freezing nights. Sunglasses with strong UV protection are essential; the glare off the salt is intense and relentless. Go in June or July for stable weather and the clearest conditions.