El Elegante (Spanish for ''elegant one'') is a

maar A maar is a broad, low-relief volcanic crater caused by a phreatomagmatic eruption (an explosion which occurs when groundwater comes into contact with hot lava or magma). A maar characteristically fills with water to form a relatively shallow ...

(a type of

volcanic crater A volcanic crater is an approximately circular depression in the ground caused by Volcano, volcanic activity. It is typically a bowl-shaped feature containing one or more vents. During Types of volcanic eruptions, volcanic eruptions, molten magm ...

) located in the

Gran Desierto de Altar The Gran Desierto de Altar is one of the major sub-ecoregions of the Sonoran Desert, located in the Sonora, State of Sonora, in northwest Mexico. It includes the only active Erg (landform), erg dune region in North America. The desert extends acro ...

in the

Sonoran Desert The Sonoran Desert ( es, Desierto de Sonora) is a desert in North America and ecoregion that covers the northwestern Mexican states of Sonora, Baja California, and Baja California Sur, as well as part of the southwestern United States (in Arizona ...

, Mexico. At deep and across, it is the largest in the

volcanic complex A complex volcano, also called a compound volcano or a volcanic complex, is a mixed landform consisting of related volcanic centers and their associated lava flows and pyroclastic rock. They may form due to changes in eruptive habit or in t ...

Pinacate Peaks The Pinacate Peaks (Sierra Pinacate, ood, Cuk Doʼag) are a group of volcanic peaks and cinder cones located mostly in the Mexican state of Sonora along the international border adjacent to the U.S. state of Arizona, surrounded by the vas ...

Formation

The crater was formed about 32,000 years ago when

groundwater Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit of rock or an unconsolidate ...

seeping down into the earth came into contact with

magma Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural sa ...

rising from beneath the crust. The hot magma instantly turned the water to steam, and the sudden high pressure triggered a phreato-magmatic explosion, blowing a huge hole in the ground, and blasting out rocks, magmatic material and

ash Ash or ashes are the solid remnants of fires. Specifically, ''ash'' refers to all non-aqueous, non- gaseous residues that remain after something burns. In analytical chemistry, to analyse the mineral and metal content of chemical samples, ash ...

, forming the crater.

Ejecta Ejecta (from the Latin: "things thrown out", singular ejectum) are particles ejected from an area. In volcanology, in particular, the term refers to particles including pyroclastic materials (tephra) that came out of a volcanic explosion and magma ...

was spread out to a distance of about from the crater over what is now the desert floor. The crater rim is higher than the surrounding desert and shows layers of rock built up from the ejecta. El Elegante contained a

lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...

during the pluvial period preceding the last altithermal period.

Biosphere Reserve

The crater is located in an important area and

nature reserve A nature reserve (also known as a wildlife refuge, wildlife sanctuary, biosphere reserve or bioreserve, natural or nature preserve, or nature conservation area) is a protected area of importance for flora, fauna, or features of geological or ...

called

El Pinacate y Gran Desierto de Altar Biosphere Reserve El Pinacate y Gran Desierto de Altar Biosphere Reserve ( es, Reserva de la Biosfera El Pinacate y Gran Desierto de Altar) is a biosphere reserve and UNESCO World Heritage Site managed by the federal government of Mexico, specifically by Secreta ...

, which was declared a

World Heritage Site A World Heritage Site is a landmark or area with legal protection by an international convention administered by the United Nations Educational, Scientific and Cultural Organization (UNESCO). World Heritage Sites are designated by UNESCO for h ...

UNESCO The United Nations Educational, Scientific and Cultural Organization is a specialized agency of the United Nations (UN) aimed at promoting world peace and security through international cooperation in education, arts, sciences and culture. It ...

in 2012. It functions as a natural park; El Elegante is the crater most visited by tourists.

References

{{coord, 31.8467, N, 113.3913, W, source:wikidata, display=title Volcanic landforms Maars of Mexico Sonoran Desert Geography of Sonora Volcanoes of Sonora