Parque Nacional Constitucion de 1857 (Laguna Hanson)

Parque Nacional Constitucion de 1857, commonly called Laguna Hanson after its central lake, occupies a high plateau in the Sierra de Juarez of Ensenada Municipality, Baja California, Mexico. The park sits at roughly 1,700 metres and is dominated by Jeffrey pine forest interspersed with rounded granite domes and boulders, giving it a landscape closer to the Sierra Nevada than the desert most visitors expect from Baja California. Laguna Hanson itself is shallow and seasonal, filling with spring rain and shrinking or drying by late summer or autumn depending on the year's rainfall, so its appearance changes considerably through the year.

As the closest true mountain wilderness to the US border, the park draws campers, hikers and photographers seeking pine forest and granite scenery without a long drive from Tijuana or Ensenada. Marked and unmarked trails wind among the boulder formations and around the lake basin, and informal camping is common along the lake's edge and in clearings among the pines. The park receives snow most winters, a rarity for the state and a draw in itself for visitors used to Baja's desert and coastal climates.

April through October is the most reliable season for a full visit, with the lake generally fullest in spring after rain and often reduced or dry by autumn. The access road is 35 km of graded dirt from Ojos Negros on Highway 3; an ordinary car can usually manage it in dry weather, though high clearance is safer, particularly after rain when the surface can rut. A half-day visit covers the lake and nearby boulder formations; overnight camping allows time to explore the trails and see the plateau at sunrise and sunset, when the granite domes take on strong colour.