This is a UNESCO World Heritage site and a UNESCO Biosphere Reserve
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| Crater Cerro Colorado |
El Pinacate and Gran Desierto de Altar Biosphere Reserve is located in the Sonoran Desert. (...) It is a large and relatively undisturbed protected area which comprises two very distinct broad landscape types. To the East, there is a dormant volcanic area of around 200,000 ha, comprised of the Pinacate Shield with extensive black and red lava flows and desert pavement. The volcanic shield boasts a wide array of volcanic phenomena and geological formations, including a small shield-type volcano. The most visually striking feature is the concentration of a total of 10 enormous, deep and almost perfectly circular Maar (steam blast) craters.
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| El Pinacate and Gran Desierto de Altar |
In the West towards the Colorado River Delta and South towards the Gulf of California, is the Gran Altar Desert, North America's largest field of active sand dunes and only active Erg dunes. The dunes can reach 200 meters in height and contain a variety of dunes types. The dunes originate from sediments from the nearby Colorado Delta and local sources. In addition, there are several arid granite massifs emerging like islands from the sandy desert flats, ranging between 300 and 650 m.a.s.l., which represent another remarkable landscape feature harbouring distinct plant and wildlife communities. - in: https://whc.unesco.org/en/list/1410
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