Multiple locations:

• Islands of the Gulf of California.
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• Upper Gulf of California – Colorado River Delta (maritime portion).
• San Pedro Mártir Island.
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• El Vizcaíno (coastal and maritime portion in the Gulf of California).
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• Loreto Bay.
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• Cabo Pulmo.
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• Cabo San Lucas.
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• Islas Marías.
• Isabel Island.
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• San Lorenzo Archipelago.
• Marietas Islands.
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• Balandra Ecological Conservation and Community Interest Zone.

This site encompasses 244 islands, islets, and coastal areas in the Gulf of California, located in the northwest of Mexico, covering the states of Baja California, Baja California Sur, Sonora, Sinaloa, and Nayarit.

These places combine unique beauty with spectacular landscapes, where the turquoise color of the Gulf of California waters contrasts with the color of the desert. In addition, the islands of the Gulf of California are recognized by the international scientific community as one of the ecologically practically intact island ecosystems in the world and one of the few remaining natural laboratories.

The total extent of the nine included protected areas is 1,838,012 hectares, of which 25% are terrestrial and 75% are marine areas, representing 5% of the total area of the Gulf of California. Due to its size, it comprises various ecosystems ranging from temperate wetlands in the north to tropical forests in the south.

This area is home to 695 species of vascular plants, of which 28 are endemic to the islands within the reserves. It is worth noting that the collective reserves offer greater richness than any other similar property inscribed on the UNESCO list.

As for the marine habitat, it is known to harbor 891 species of fish, of which 90 are endemic. It is also the habitat for 39% of the globally recorded marine mammal species and one-third of cetacean species. In fact, the biodiversity is so varied that Jacques Cousteau referred to the Gulf of California as the "world's aquarium."