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The Gran Desierto sand sheets and dunes are located atop deltaic deposits of the Pleistocene Colorado River. The lower Colorado River was captured by the Gulf of California 1.2 million years before present. [9] This event places an upper bound on the age of the Gran Desierto with the Colorado's major clastic sediment sources.
El Pinacate and Gran Desierto de Altar Biosphere Reserve (Spanish: Reserva de la Biosfera El Pinacate y Gran Desierto de Altar) is a biosphere reserve and UNESCO World Heritage Site [1] managed by the federal government of Mexico, specifically by Secretariat of the Environment and Natural Resources, in collaboration with the state governments of Sonora and the Tohono O'odham.
The Pinacate Peaks (Sierra Pinacate, O'odham: 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 vast sand dune field of the Gran Desierto de Altar, at the desert's southeast. [1]
El Pinacate y Gran Desierto de Altar Biosphere Reserve (Spanish: Reserva de la Biosfera El Pinacate y Gran Desierto de Altar), is a biosphere reserve and UNESCO World Heritage Site [4] It is in the Sonoran Desert in the eastern part Gran Desierto de Altar, just south of the border with Arizona, United States and north of the city of Puerto Peñasco.
The Algodones Dunes. The Colorado Desert is a subregion of the larger Sonoran Desert, [1] covering about 7 million acres (2.8 million ha; 28,000 km 2). [2] The desert occupies Imperial County, parts of San Diego and Riverside counties, and a small part of San Bernardino County in California, United States, [3] as well as the northern part of Mexicali Municipality in Baja California, Mexico.
The Great Basin Desert is part of the Great Basin between the Sierra Nevada and the Wasatch Range in the western United States.The desert is a geographical region that largely overlaps the Great Basin shrub steppe defined by the World Wildlife Fund, and the Central Basin and Range ecoregion defined by the U.S. Environmental Protection Agency and United States Geological Survey.
The Altar Valley is a 45-mile (72 km) long north–south valley, trending slightly northeast from Sasabe, Arizona on the Mexico border to the Avra Valley west of the Tucson Mountains. It is delimited by Arizona State Route 86 , from east-to-west on the north separating it from the Avra Valley which then trends northwesterly , merging into the ...
The borders of Colorado are now officially defined by 697 boundary markers connected by straight boundary lines. [3] Colorado, Wyoming, and Utah are the only states that have their borders defined solely by straight boundary lines with no natural features. [4] The southwest corner of Colorado is the Four Corners Monument at 36°59'56"N, 109°2 ...