Nahá-Metzabok Biosphere Reserve, Biosphere reserve in Chiapas, Mexico.

Nahá-Metzabok Biosphere Reserve is a protected area in southeastern Chiapas with montane rainforests, pine forests, oak woodlands, and natural lakes scattered throughout. The terrain sits on limestone hills with several enclosed lakes that have no visible outlets to the outside.

The Nahá and Metzabok flora and fauna protection areas were designed in 1998. In 2004 both were designated a Ramsar wetland of international importance, covering 72.16 km2. The biosphere reserve, adding a buffer zone around the two core areas, was designated in 2009. Communal land tenure in the core zone is recognized by the Mexican government, while the buffer zone is mainly ejidos.

Lacandon, Tzeltal, and Ch'ol Maya people inhabit this place and shape how it functions through their long-standing relationship with the land. Their presence continues to influence how resources are managed and the reserve is cared for.

The reserve is best explored through guided tours that take visitors to the lakes and through the different forest types. Plan for hilly terrain and wet conditions, especially during the rainy season.

The Nahá and Metzabok lake systems are connected to each other and form a closed basin, with no known surface or subsurface outflow. Lake levels fluctuate about 10 meters annually with rainfall; during the March–August 2019 drought, Lake Metzabok dried up completely and Lake Tzibaná dropped 15 meters.