Islas Marías
A Pacific archipelago off Mexico’s northwestern coast, these four islands hold a complex legacy spanning Indigenous absence, Spanish discovery, penal confinement, and ecological significance.
At a glance
The Islas Marías comprise four islands in the Pacific Ocean, located approximately 100 km west of Nayarit state and part of the San Blas municipality. Long known as a federal penal facility, the islands transitioned to conservation status following the 2019 closure of their prison operation.
History
Diego Hurtado de Mendoza, cousin of Hernán Cortés, first encountered the islands in 1532 and named them Islas Magdalenas. He found no evidence of Native American settlement. For centuries the islands remained largely isolated until their conversion into a penal colony. President Andrés Manuel López Obrador ordered the closure of Islas Marías Federal Prison on February 18, 2019, marking a decisive end to the archipelago’s use as a place of confinement.
What you see
Information about the islands’ physical structures and landscape features is limited in available sources.
Cultural significance
The Islas Marías represent a turning point in Mexican penal policy and environmental stewardship. UNESCO recognition as a biosphere reserve in 2010 underscored the archipelago’s ecological importance, shifting focus from incarceration to conservation and scientific study of its unique Pacific habitat.
Key facts
- Country: Mexico
- State: Nayarit (municipality of San Blas)
- Location: ~100 km off the Nayarit coast; ~370 km southeast of Baja California tip
- Composition: Four islands
- Coordinates: 21.52°N, 106.48°W
- UNESCO Biosphere Reserve: Designated 2010
- Prison closure: February 18, 2019
Practical information & getting there
The islands are accessible by boat from the Nayarit coast. Current conditions and visitor policies should be confirmed with local authorities in San Blas, as the islands’ status continues to evolve following the prison closure.
Sources & resources
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