Residents near the Sierra de la Laguna Biosphere Reserve in southern Baja California Sur have uncovered a covert construction operation deep inside the protected area. Community members detected more than 100 flights transporting tools and building materials into the reserve, along with hidden equipment in the Segundo Valle and undisclosed campsites on federal land. The scale of the operation points to a well-funded effort to build inside one of Mexico’s most ecologically sensitive zones without authorization.
Sierra de la Laguna: UNESCO Protected Since 1994
The Sierra de la Laguna Biosphere Reserve covers roughly 112,437 hectares of rugged mountain terrain between the municipalities of La Paz and Los Cabos. Mexico’s federal government designated it a biosphere reserve in 1994, and UNESCO added it to its global network the same year. The sierra rises to over 2,000 meters and traps moisture that feeds freshwater springs critical to downstream communities and agriculture in the Cape Region.
The reserve shelters more than 900 plant species, dozens of them endemic. The relict oak and pine forests at the summit exist nowhere else on the Baja California peninsula. CONANP, Mexico’s national protected areas commission, manages the reserve and restricts construction, logging, and motorized access within its core and buffer zones. Any building activity requires federal environmental impact authorization from SEMARNAT, Mexico’s environment ministry, and a separate land use permit.
Illegal construction inside an Área Natural Protegida (ANP) is a federal crime under Mexico’s General Law of Ecological Balance and Environmental Protection. Penalties range from fines of up to 50,000 days of minimum wage (roughly 13 million pesos, or about $650,000 USD at current rates) to prison sentences of up to nine years when damage to protected ecosystems is proven. PROFEPA, Mexico’s federal environmental enforcement agency, holds jurisdiction over inspections and criminal referrals inside biosphere reserves.
More Than 100 Supply Flights Detected by Local Communities
The discovery came from residents of communities bordering the reserve who noticed repeated low-altitude flights heading into the mountains. Over time, they counted more than 100 sorties carrying tools, construction materials, and supplies. On the ground, they found cached equipment in the Segundo Valle, a remote interior valley, and located campsites that had not been authorized by CONANP or any other authority.
The source reporting does not identify who organized or financed the flights. No company name, developer, or individual has been publicly linked to the operation. That gap raises urgent questions. Chartering over 100 helicopter or small-plane flights into mountainous terrain is expensive. Landing zones would need to be cleared. Fuel, pilots, and logistics suggest either a private developer with significant capital or an organized operation with resources beyond a single landowner.
Community members in the Sierra de la Laguna corridor have a long history of monitoring access to the reserve. Ranchos like San Dionisio and Boca de la Sierra serve as trailheads and informal gateways. Residents there know the terrain and notice unusual air traffic quickly. Their reports have been relayed to authorities, though the source material does not specify which agencies have responded or whether PROFEPA has opened a formal investigation.
Prior Illegal Development Cases in Baja California Sur Reserves
This is not the first time unauthorized construction has been found inside protected areas in the state. In 2014, PROFEPA shut down an illegal road being cut through the Estero San José, a protected wetland at the southern tip of the peninsula near San José del Cabo. In 2023, federal authorities investigated unpermitted clearing and grading near Balandra Bay outside La Paz, which holds federal ANP status. Both cases involved months of activity before enforcement agencies intervened.
Across Mexico, biosphere reserves face persistent pressure from land speculation. In Quintana Roo, illegal subdivisions inside the Sian Ka’an Biosphere Reserve led to federal criminal charges in 2021. The pattern is consistent: remote, high-value land attracts developers who bet that enforcement will be slow or absent. In Baja California Sur, the real estate boom around Los Cabos and the East Cape has pushed land prices higher in surrounding areas, including parcels near the sierra’s buffer zones.
The Sierra de la Laguna is a popular hiking and camping destination. Tour operators in Santiago and San José del Cabo run multi-day treks into the Segundo Valle and to the summit. If construction activity is underway in these areas, hikers may encounter restricted or altered trails, cleared landing zones, or construction debris in otherwise pristine backcountry.
CONANP’s management plan for the reserve was last updated in 2003. Environmental advocates have pushed for a revision that would tighten access controls and increase ranger presence. The reserve currently operates with limited staff and no permanent checkpoints on its main access routes from Santiago or Caduaño.
No federal agency has issued a public statement on the flights or construction activity as of this reporting. The next step would be a formal PROFEPA inspection and, if violations are confirmed, a criminal referral to FGR, Mexico’s federal attorney general’s office. This story was first reported by Zeta Tijuana.