Pacific OceanMexico
21°29′N 106°27′W
Islas Marías
The Islas Marías ("Mary Islands") make up an archipelago in Mexico, consisting of four principal islands and five smaller islands/large offshore rocks. They are located in the Pacific Ocean, some 100 km (62 mi) off the coast of the state of Nayarit and about 370 km (230 mi) southeast of the tip of Baja California.

Earth Science and Remote Sensing Unit, Lyndon B. Johnson Space Center / Public domain
Chart
Overview
The Islas Marías ("Mary Islands") make up an archipelago in Mexico, consisting of four principal islands and five smaller islands/large offshore rocks. They are located in the Pacific Ocean, some 100 km (62 mi) off the coast of the state of Nayarit and about 370 km (230 mi) southeast of the tip of Baja California. They are part of the municipality (municipio) of San Blas, Nayarit. The islands were used as a penal colony until February 18, 2019, when President Andrés Manuel López Obrador ordered the closure of its operation as Islas Marías Federal Prison. The first European to encounter the islands was Diego Hurtado de Mendoza, a cousin of Hernán Cortés in 1532, who gave them the name Islas Magdalenas. He found no evidence of prior habitation by the Native Americans. In 2010 the archipelago was designated the Islas Marías Biosphere Reserve by UNESCO.
From Wikipedia, CC BY-SA 4.0
Census, cataloged
- Major islands2
- Minor islands2
- Islets0
- Rocks & skerries0
Major islands
Isla María Magdalena
- Area
- 67.5 km²
- High point
- 573 m
Isla María Madre
- Area
- 141 km²
- High point
- 636 m
Minor islands

Isla María Cleofas
- Area
- 18.7 km²
- High point
- 381 m
San Juanito
- Area
- 8.6 km²
- High point
- 67 m
Also in the area
Inside the group's outline but not confirmed as members by any source.
- Isla Piedra Blanca64 m · 0.15 km²
- Roca Piedra el Morro25 m · 0.03 km²
Figures
Comparative heights
- Isla María Madre: 636 m
- Isla María Magdalena: 573 m
- Isla María Cleofas: 381 m
- San Juanito: 67 m
- Isla Piedra Blanca: 64 m
- Roca Piedra el Morro: 25 m
To the same scale
Islands by area
| Isla María Madre | 141 km² |
| Isla María Magdalena | 67.5 km² |
| Isla María Cleofas | 18.7 km² |
| San Juanito | 8.6 km² |
| Isla Piedra Blanca | 0.15 km² |
| Roca Piedra el Morro | 0.03 km² |
Photographs

View of Mexico taken during ISS Expedition 6.
Earth Science and Remote Sensing Unit, Lyndon B. Johnson Space Center / Public domain

Figure 2. Vegetation typed on María Cleofas Island A scrub forest B small area of Rhizophora mangle C tropical sub-deciduous, and D deciduous forest.


NASA astronaut image of María Magdalena Island, Islas Marías, Mexico)

NASA astronaut image of María Cleofas Island, Islas Marías, Mexico)
Sources
Facts
Photographs
- ISS006-E-19025 - View of Mexico. Earth Science and Remote Sensing Unit, Lyndon B. Johnson Space Center / Public domain
- María Cleofas Island (10.3897-zookeys.1024.60473) Figure 2. Ramírez-Reyes T, Barraza-Soltero IK, Nolasco-Luna JR, Flores-Villela O, Escobedo-Galván AH (2021) A new species of leaf- / CC BY 4.0
- María Cleofas Island (10.3897-zookeys.1024.60473) Figure 3. Ramírez-Reyes T, Barraza-Soltero IK, Nolasco-Luna JR, Flores-Villela O, Escobedo-Galván AH (2021) A new species of leaf- / CC BY 4.0
- Islas Marias banner. Terry Lucas / CC BY 3.0
- Maria Magdalena ISS006. NASA / Public domain
- Maria Cleofas ISS006. NASA / Public domain
- Maria Madre ISS006. NASA, mosaic by Szczureq / Public domain