Why Everyone Misunderstands America's Largest Desert

Sprawling across northern Mexico and into the southwest region of the U.S. is a vast desert region of sandy basins, arid shrublands, and two large mountain ranges that literally trap the desert on both sides. And despite being relatively unknown, it's actually the largest desert in North America. From being home to the dawn of the nuclear bomb, to being an area with sand so white that it literally looks like it belongs in a fantasy novel. Here are 15 fascinating geography facts you never knew about the Chihuahuan Desert. Hey, I have a book coming out in 2027 called Badlands. Stick around to the end to learn more about it. The Chihuahuan Desert is the largest hot desert in North America, with an area of nearly 200,000 square miles, making it larger than the entire state of California. It makes up the heart of northern Mexico, covering part of a high elevation region known as the Mexican Plateau. It stretches across the Mexican states of Chihuahua, Coahuila, Durango, Zacatecas, and Nuevo Leon. And its northern extremes extend into the United States as well, specifically Texas, New Mexico, and Arizona. Not only is this searing plateau more than twice the size of the neighboring Sonoran Desert, but it's actually larger than all of North America's other hot deserts combined, the Sonoran, the Mojave, and the Baja California Desert. The Chihuahuan Desert is a product of Northern Mexico's geography, kept parched by the mountains along its borders. The desert is bounded on both the east and west by towering mountain ranges, the Sierra Madre Oriental and the Sierra Madre Occidental, which run in parallel from the northwest to the southeast. These mountain ranges can climb to over 10,000 feet in some places, and they block moisture from traveling inland, creating a rain shadow that keeps the Northern Mexican interior extremely dry. Because these mountains wall off the Chihuahuan deserts on both sides, moisture from both the Pacific Ocean and the Gulf of Mexico struggles to reach the desert. The main exceptions are in the late summer, when the North American monsoon sweeps across the Mexican plateau, which makes the Chihuahuan desert slightly wetter than many other hot deserts, despite the double rain shadow. When you think of a desert, you probably think of endless sand dunes and rocky wastes, but much of the Chihuahuan Desert is actually dominated by desert shrubland and desert grassland. In these regions, hardy desert shrubs like the creosote bush thrive in the sandy or gravelly soil, creating a landscape that, while still very dry and blisteringly hot, is far from barren or lifeless. In fact, roughly 20% of the Chihuahuan Desert consists of desert grasslands, which, According to the accounts of early Spanish explorers, were once dominated by grasses that reached up to the stomach of a horse. These grassland regions have been under severe threat, however, mostly from human activity over the last few centuries and, more recently, the changing climate. This means that the more barren stretches of the desert are steadily expanding, reducing the overall biodiversity of a very unique part of North America. It's not just flora that's unusually diverse or abundant in the Chihuahuan Desert, either. In general, this desert is the most ecologically diverse in the entire Western Hemisphere. The desert is home to more than 3,500 plant species, which include about 1,000 species that are only found here, and a full third of the world's cactus species. The Chihuahuan Desert is also home to more than 170 reptile and amphibian species, More than 130 mammal species and more than 400 bird species. These include pronghorns, jaguars, prairie dogs, the legendary golden eagles, and many others. But perhaps most shockingly, the desert is also home to more than 110 fish species. That's right, North America's largest desert is also surprisingly diverse in terms of aquatic life. Most are found in river systems like the Rio Grande, while others can be found in smaller creeks and isolated springs. Located within the Northern Chihuahuan Desert is the United States White Sands National Park, so named for the awe-inspiring white sands that cover its expanse. This 275 square mile stretch of the desert is covered by dunes of snow white gypsum sand, the largest gypsum dune field in the entire world. The white sands were created towards the end of the last ice age when this stretch of the desert was covered by large lakes and fertile grasslands. As the climate warmed, Meltwater from the neighboring mountains eroded away large amounts of gypsum, carrying them down into the lakes below. When the lakes dried up, the dissolved gypsum formed selenite crystals, which were eventually eroded into vast dunes of gypsum sand. It easily makes for one of the most surreal, and beautiful landscapes in the entire world. Exploring surreal, isolated landscapes like the Chihuahuan desert is an incredible experience. But losing your connection and hunting for Wi-Fi in an unfamiliar country can quickly turn any trip into a nightmare. To avoid roaming fees and the hassle of buying new SIM cards in every country I visit for my field geography channel, Geolex, I rely on today's sponsor eSIM.io. eSIM.io is a global travel connectivity app that provides seamless... Internet access in over 200 countries. What makes it completely stress-free is their core feature, one SIM. You literally install the eSIM just one single time and it keeps you connected everywhere. There's no swapping physical SIM cards, no reinstalling new digital profiles when you cross borders, and absolutely no roaming surprises. Inside the app, you can choose the option that perfectly fits your travel style. 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Before that, the northern Mexican plateau was a much wetter place, covered by forests, grasslands and lakes. But as the Earth began a new warming period, The ice sheets began to shrink. What once covered most of North America quickly receded to the far north. This caused climate change shifts across the globe and Northern Mexico's surprisingly green environment slowly dried up. Lakes shrank, rivers faded, and forests retreated into the mountains. After centuries of desertification, the modern Chihuahuan desert came into being. Unlike many deserts, the Chihuahuan Desert is home to a remarkable number of large mammals. And it was once home to even more. On top of modern jaguars, pronghorns, and desert bighorn sheep, it was once also home to wolves, grizzly bears, and extinct Pleistocene megafauna, like giant ground sloths, Colombian mammoths, American lions, and dire wolves. Before the European colonization of the Americas, The Chihuahuan Desert had the distinction of being one of the only regions where grizzly bears, wolves, and jaguars shared a habitat. That made it not just a haven for large mammals in general, but also one of the few places where the America's deadliest mammalian predators coexisted. Needless to say, if all those mammals still existed there today, humans probably would keep a much farther distance. On top of its gypsum dunes, White Sands National Park in the Northern Chihuahuan Desert also contains one of the most important archaeological finds in the Western Hemisphere, the White Sands Footprints. These ancient human footprints preserve a record of a nearly 2,000 year long period when people lived in this part of North America. But what made them such a groundbreaking discovery was their age. Radiocarbon dating has estimated that these footprints are between 21,000 and 23,000 years And if those dates are correct, that may make them the oldest evidence of human habitation in the Americas. While the precise dating of the White Sands Footprints is still debated, they could push back the timeline of human settlement in the Americas by nearly 5 to 10,000 years. Most theories suggest humans arrived to the general region of New Mexico somewhere between 13,000 and 16,000 years ago. Usually, we name our geographic places after a person, a physical aspect of the place, or even a poetic feeling. But the name of the Chihuahuan Desert comes simply from the Mexican state of Chihuahua, which in turn was named for Chihuahua City. And that's about all we know, because where exactly the name Chihuahua came from originally is unclear. We know that it's an indigenous word that predates the Spanish conquest of Mexico, but which language it came from, or what exactly it means, isn't clear. Some of the more prominent theories include that Chihuahua comes from a Nahuatl word meaning between two waters, a reference to Chihuahua City's location at the confluence of the rivers Sacramento and Chubascar, or that it's a Rarámuri word meaning dry and sandy place. All we can say for certain is that the Chihuahuan desert is not named for the Chihuahua species of dog. The colonization of the Americas hasn't done the Chihuahuan Desert any favors, as the vast herds of cattle brought in by settlers have massively overgrazed its fragile grasslands, contributing to ongoing desertification. Over the course of the past 150 years, intensive grazing from large cattle herds has devastated the native grasses, stripping vast regions of the desert bare. In some places, shrublands have expanded to replace the depleted grassland, while in others, What used to be thriving grassland. is now utterly barren, a testament to what can happen when people over-exploit fragile desert environments. The ecosystem of the Chihuahuan Desert is still severely degraded, and human activity continues to make it worse. The Chihuahuan Desert straddles the border between the U.S. and Mexico, and despite being a desert, there's quite a few people living in it on both sides of the border. In Mexico, some of this region's big cities include Ciudad Juarez, with a population of more than 2 million, as well as Chihuahua City, Saltillo, and Torreon. In the United States, the Chihuahuan Desert is home to El Paso, Albuquerque, Las Cruces, and Roswell. Many smaller communities are scattered across the desert as well, making this corner of North America much livelier than you might think. In fact, when you add up the population of just the major metro regions of the Chihuahuan desert, you end up with somewhere around 7 million people, larger than most individual US states today. Ciudad Juarez and El Paso together form a huge transnational urban region with a combined population of somewhere around 2.5 million people. Despite lying on opposite sides of the US-Mexico border, these two cities have a shared history and culture and many people still regularly commute across the border for work or education. Founded as El Paso del Norte in 1659, these twin cities were originally one settlement, But the northern side was ceded to the U.S. in 1850. The two halves of El Paso, the older Mexican part, of which was renamed Ciudad Juarez in 1888, continued to function as a single community for decades afterward. However, and to an extent, they still do today. It's not too much to say that the economies of both rely on them being a single cohesive unit, even if they're separated by an international border. Due to the uniqueness and extraordinary biodiversity of the Chihuahuan Desert ecoregion, roughly 7% of the desert is considered protected lands, part of national parks, national monuments, and wildlife reserves across both the US and Mexico. Apart from the previously mentioned White Sands National Park, the US side of the desert contains Big Bend National Park and Guadalupe Mountains National Park, while protected areas on the Mexican side include the Janos Biosphere Reserve, The Canón de Santa Elena flora and fauna protection area and the Mapimi biosphere reserve. These protected areas are vital for the preservation of many endangered plants and animals native to the Chihuahuan desert. And some of them have even seen the introduction of animals that had previously been wiped out in this region, most prominently the American bison. The Chihuahuan Desert also contains substantial oil and natural gas reserves, most notably in the Permian Basin of New Mexico and Texas and northern Mexico's Burgos and Sabinas basins. The Permian Basin is the highest producing oil field in the entirety of the United States, having produced nearly 29 billion barrels of oil and 75 trillion cubic feet of natural gas. This industry has, unfortunately, contributed extensively to the degradation of the desert's environment. Wastewater from the drilling process has polluted large stretches of the desert, while global climate change threatens to wipe out or displace nearly half of the Chihuahuan Desert's native mammal, bird, and butterfly species by 2055. So, some could say that the preservation of the Chihuahuan Desert is directly at odds with the extraction of its natural resources. The Jornado del Muerto desert, one of the northernmost arms of the Chihuahuan desert, was instrumental in the development of one of humanity's most destructive creations, the atomic bomb. The Trinity site in this part of the desert saw the world's first detonation of a nuclear weapon in July 1945, a test that marked the dawn of the atomic age. The success of that test kicked off almost a century's worth of nuclear weapons development, and it paved the way for atomic bombs to be dropped on Japan at the close of World War II. Today, the Trinity site is a U.S. National Historic Landmark, and a rough-sided column of lava rocks stands at the center of of the Trinity test explosion. People tend to imagine deserts to be empty wastelands, but even the most barren and inhospitable stretches of Earth are full of fascinating living things and incredible history. The Chihuahuan Desert is certainly no exception. 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