Sierra de la Laguna Biosphere Reserve

The Sierra de la Laguna Biosphere Reserve occupies the granite massif that fills the interior of southern Baja California Sur, between Los Cabos on the coast and Todos Santos on the Pacific side. Rising to 2,163m at Picacho de la Laguna, the range is a sky island: the desert scrub and cardón forest of the lower slopes give way with altitude to oak woodland and then to a genuine pine-oak forest that exists nowhere else on the peninsula. The contrast is the point of coming — visitors climb out of cactus desert into cool pine shade in the course of a single day's walk.

The reserve's centrepiece is La Laguna, a broad high meadow at around 1,700m that was once a lake and now holds seasonal grassland ringed by pines. Two main routes reach it: the eastern approach from San Dionisio in the Sierra foothills and the western approach from La Burrera near Todos Santos, each a demanding full-day ascent of roughly 12-16km with substantial elevation gain. Shorter walks from Santiago and Miraflores reach palm-lined canyons and waterfalls, including the Cañón de la Zorra with its swimmable pool, without committing to the summit. Endemic plants, mule deer, ring-tailed cats, mountain lions and a heavy passage of migratory birds all occur here; the reserve protects the peninsula's only significant freshwater catchment.

Entrance costs roughly $5-10 USD per adult and $3 for children, and a local guide is effectively required for the high routes: trails are lightly marked, water sources are seasonal, and rescue is slow. Guides can be arranged in Todos Santos, Santiago or Miraflores. Day walks in the lower canyons take four to six hours; reaching La Laguna and returning is a hard 10-12 hour day, and most parties camp overnight in the meadow instead.

Temperatures drop sharply with altitude and can approach freezing on winter nights in the high meadow, even while the coast stays warm. September through November, after the summer rains, brings running water, green slopes and the clearest air; the trails become slippery and canyons flash-flood during the July-September storm season.