The Great Basin is the largest desert in the United States, covering roughly 200,000 square miles across Nevada, western Utah, eastern California, southeastern Oregon, and southern Idaho. It is larger than California and comparable in size to France, yet it holds very few residents. The region is defined by a simple geographic rule: no river or stream within it ever reaches the ocean. Rainwater either evaporates, sinks into the ground, or collects in salty lakes with no outlet.

The basin sits on the floors of two ancient inland seas. Lake Bonneville covered about 20,000 square miles of western Utah, eastern Nevada, and southern Idaho at its peak around 14,500 years ago, reaching depths of 1,000 feet. Lake Lahontan covered 8,500 square miles across northwestern Nevada, northeastern California, and southern Oregon around 12,700 years ago. Both lakes existed while humans were already present in the region. Lake Bonneville ended suddenly when it overtopped its rim at Red Rock Pass in Idaho and released a massive flood. Lake Lahontan receded gradually, leaving behind smaller lakes such as Pyramid Lake, Walker Lake, and Mono Lake.

The region contains between 160 and 400 mountain ranges, depending on how they are counted. Geologists call this the Basin and Range Province, the only place on Earth where a piece of continental crust this large is being actively stretched apart. Driving across northern Nevada on Interstate 80 means crossing eight separate mountain ranges over 600 miles.

Nevada produces about 76 percent of all gold mined in the United States, making it the fourth-largest gold-producing jurisdiction in the world after China, Australia, and Russia. Most of this gold is invisible to the eye. The deposits along the Carlin Trend in northern Nevada exist as sub-microscopic particles dissolved inside pyrite crystals. They were not discovered at scale until 1961, when a geologist named John Livermore used chemical assays rather than visual inspection.

Fly Geyser, about two hours north of Reno, is a geothermal formation that shoots boiling water several feet into the air and is covered in colorful algae. It was created by accident in 1964, when a geothermal energy company drilled a test well, failed to find what it wanted, and left the hole unsealed. Pressurized hot water has been escaping continuously since then, depositing calcium carbonate and building the cone over time. The Burning Man Project has owned the site since 2016 and offers limited guided tours.

Samuel Clemens first used the pen name Mark Twain in Virginia City, Nevada, on February 3, 1863, while working as a reporter for the Territorial Enterprise. The name came from a Mississippi River leadsman’s term for safe water depth. Clemens picked it up in a high-desert mining town roughly 800 miles from any navigable river.

The Comstock Lode, discovered in western Nevada in 1859, produced enormous quantities of silver and gold. President Lincoln pushed for Nevada statehood in 1864, shortly before the presidential election, because the territory’s silver and electoral votes were valuable to the Union war effort. Peak production in 1877 was worth the equivalent of hundreds of millions of dollars today.

Racetrack Playa in Death Valley National Park contains rocks weighing up to 700 pounds that move across the flat lake bed on their own, leaving long trails behind them. For 80 years, the cause was unknown. Scientists finally recorded the mechanism in December 2013 using time-lapse cameras. In rare winters, when the playa floods and freezes, thin sheets of ice break up in the morning sun, and wind pushes the floating ice into the rocks, scraping them across the wet mud.

Berlin-Icthyosaur State Park in central Nevada preserves roughly 40 fossilized skeletons of Shonisaurus popularis, Triassic-era marine reptiles up to 50 feet long. They have lain there for about 225 million years, when the region was the floor of a tropical ocean at the western edge of the supercontinent Pangaea. Recent research suggests the animals may have come to the area to give birth.

Great Basin National Park contains a permanent body of ice on the north face of Wheeler Peak, a 13,063-foot summit that rises about 8,000 feet above the surrounding desert. The rock glacier, a mixture of ice and rock roughly the size of a city block, has existed for around 10,000 years. Scientists have tracked its retreat every summer since 2005.

The Pony Express operated for exactly 18 months, from April 1860 to October 1861, when the completion of the transcontinental telegraph made it obsolete. Nevada contained 47 of its 197 stations. The most famous ride was made by Robert “Pony Bob” Haslam in May 1860, when he carried mail roughly 380 miles round trip in under 36 hours. He was 19 years old.

Steens Mountain in southeastern Oregon is a single fault block of basalt 40 miles long, reaching 9,733 feet, with an east face that drops 5,500 feet to the Alvord Desert floor. It is the largest fault-block mountain in North America. Hot springs at the base of the cliff bubble up at about 170 degrees Fahrenheit and cool in concrete pools.

The Humboldt River rises in northeastern Nevada and flows roughly 300 miles southwest before disappearing into the Humboldt Sink, where it evaporates or sinks into the ground. It is the longest river in Nevada and the only river of that size in the United States that never reaches the sea.

Roughly half of all wild mustangs in the United States, somewhere between 40,000 and 50,000 horses, live in Nevada and the broader Great Basin. Their federal protection is largely due to Velma Bronn Johnston, a Reno woman who saw wild horses being transported to a slaughterhouse in 1950. Over the next 21 years, she campaigned for federal protection, mobilizing schoolchildren to write to Congress. The Wild Free-Roaming Horses and Burros Act passed in December 1971 with no dissenting votes.

Mono Lake, at the western edge of the Great Basin in California, is more than 700,000 years old. Its limestone tufa towers formed underwater at the mouths of freshwater springs. In 1941, the Los Angeles Department of Water and Power began diverting the lake’s tributary streams through a 350-mile aqueduct. Over 53 years, the lake dropped 45 vertical feet, its surface area shrank by nearly a third, and its salinity doubled, exposing the towers to air.

The Western Shoshone Nation signed the Treaty of Ruby Valley with the United States in 1863, under which they did not cede any land but agreed only to allow safe passage. By the 20th century, the federal government claimed about 24 million acres of former Western Shoshone territory, including the land that became the Nevada Test Site. In 1974, the Bureau of Land Management sued two sisters, Mary and Carrie Dann of Crescent Valley, Nevada, for grazing cattle on land they considered their own. The U.S. Supreme Court ruled against them in 1985. In 2002, the Inter-American Commission on Human Rights ruled in their favor. Congress offered $145 million to settle the claim; the tribe refused because accepting would extinguish it. Mary Dann died in 2005; Carrie Dann continued the fight until her death in 2021. The land remains disputed.

Great Basin National Park contains at least 40 known caves. Lehman Caves, the longest in Nevada, includes more than 300 formations called shields, a rarity in most caves. The limestone rock dates back about 550 million years. The caves are home to the Great Basin Cave Pseudoscorpion, found nowhere else on Earth.

The official record for the highest air temperature ever measured on Earth is 134 degrees Fahrenheit, recorded at Greenland Ranch in Death Valley on July 10, 1913. In November 2025, a paper published in the Bulletin of the American Meteorological Society argued that this reading was probably 12 to 16 degrees too high, citing a non-standard instrument shelter and reflected sunlight. The World Meteorological Organization is reviewing the claim. The record stands for now.

In August 1940, two archaeologists entered a small cave 13 miles east of Fallon, Nevada, and found a naturally mummified human body wrapped in a rabbit-skin blanket. Later carbon dating placed the remains at about 10,600 years old. The individual, known as the Spirit Cave Mummy, died roughly 5,600 years before the oldest Egyptian mummy with a known identity. The Fallon Paiute-Shoshone tribe claimed the remains as an ancestor. The federal government held them for 76 years before returning them to the tribe in 2016. They were buried in 2018.

Burning Man takes place each August on the Black Rock Desert playa in northwestern Nevada, the dried floor of Ice Age Lake Lahontan. Around 80,000 people build a temporary city for nine days. The playa’s silt deposits reach nearly two miles thick at their deepest point.

Spiral Jetty, a land art installation by Robert Smithson, was built in April 1970 on the shore of the Great Salt Lake in Utah. The 1,500-foot counterclockwise spiral of black basalt was submerged when the lake’s water level rose in 1972. It sat underwater for 30 years. After the lake dropped in 2002, the work became visible again and remains so.

Pyramid Lake in northwestern Nevada is a closed-basin desert lake and was once home to the Lahontan cutthroat trout, which regularly grew to 30 or 40 pounds. A fisherman caught a 41-pound specimen in 1925, a world record. The population went extinct within about 20 years after Derby Dam on the Truckee River cut off the spawning migration. A small population was found in a remote Utah stream in 1977, and a USGS biologist spent decades reintroducing the fish. In 2014, wild Lahontan cutthroats spawned in the Truckee River for the first time since World War II.

The Great Salt Lake, 3.5 to eight times saltier than the ocean, supports almost no life except brine shrimp. It is the world’s largest single source of brine shrimp eggs, accounting for roughly 45 percent of global commercial supply. Those eggs are shipped to shrimp farms and fish hatcheries around the world, where they feed about 20 billion pounds of farmed seafood per year.

The Devil’s Hole pupfish lives in a single flooded limestone cavern in Amargosa Valley, Nevada, a pool of warm water roughly the size of a two-car garage. It is the only place on Earth where the species exists. In spring 2013, the wild population was counted at 35 fish. In April 2016, three men broke through a locked gate, fired a shotgun at cameras, and one swam in the pool. One pupfish was found dead the next morning. The species survived.

The oldest living non-clonal tree on the planet is a Great Basin bristlecone pine called Methuselah in the White Mountains of eastern California. It is approximately 4,857 years old as of 2026, having germinated around 2833 BC. Its exact location is kept secret to prevent vandalism. In 2013, scientists confirmed an even older bristlecone, 5,065 years old, in the same grove.

In November 1924, about 70 unarmed men from the Owens Valley in California opened the gates of the Los Angeles Aqueduct and sent water back down the dry Owens River for the first time in 11 years. They held the gates for four days, joined by about 700 supporters. The aqueduct had drained the valley’s water since it opened in 1913, destroying the local economy. Los Angeles resumed taking water afterward. Owens Lake is now the largest single source of particulate air pollution in the United States.

Great Basin National Park is certified as a gold-tier international dark sky park. On clear nights, the darkness reaches Bortle class two, a level where a phenomenon called gegenschein, a faint oval glow opposite the sun caused by interplanetary dust, is visible. There is little artificial light within 200 miles in any direction.

The Great Salt Lake has lost nearly half its total volume since 1847, when Mormon settlers arrived in the valley. In summer 2022, it reached its lowest recorded level. The exposed lake bed contains arsenic and other metals, which blow in dust storms across northern Utah.

Bodie, California, a gold-mining town in the eastern Sierra Nevada, reached a peak population of around 10,000 in 1879 with 65 saloons and 30 active mines. The last mine closed in 1942. The town is now preserved under California State Parks’ policy of arrested decay, meaning buildings are stabilized but not restored. More than 170 original wooden buildings still stand, with dishes on shelves and clothes still in closets.

Thacker Pass in Humboldt County, Nevada, is the largest confirmed lithium deposit in North America and possibly the world, with estimates 10 to 12 times larger than what was previously considered the largest site. The Northern Paiute and Western Shoshone call the area Peehee Mu’hah, or Rotten Moon. In September 1865, U.S. Army soldiers killed dozens of Paiute men, women, and children camped there while the hunters were away. Twenty-two tribes consider the site sacred. Three tribes filed federal lawsuits to stop the mine, but courts denied motions to halt it. Construction began in 2025.

The 509th Composite Group, the unit that dropped atomic bombs on Hiroshima and Nagasaki, conducted its flight training at Wendover Army Airfield on the Utah-Nevada border. At its peak, the base housed 17,500 soldiers. The crews practiced dropping dummy bombs shaped like the Fat Man plutonium bomb across the Bonneville Salt Flats. The hangar that housed the Enola Gay still stands.

Area 51, officially called the Groom Lake facility, sits on a dry salt flat 83 miles northwest of Las Vegas. The CIA did not publicly acknowledge the base’s existence until 2013, nearly 60 years after it was founded in 1955. The U-2 spy plane, the SR-71 Blackbird, and the F-117 stealth fighter were all developed there. The base is part of the larger Nevada Test and Training Range, covering 3.1 million acres.

The Donner Party disaster began on the Great Salt Lake Desert in 1846, not in the Sierra Nevada. Following advice from a man named Lansford Hastings, the 87-person group attempted a crossing they were told would take two days. It took six days and covered 70 miles. They lost four wagons and most of their draft animals. Arriving at the Humboldt River, they were about three weeks behind the safe window for crossing the Sierra Nevada. Forty-two members of the party died before reaching California.

On October 15, 1997, a British jet car called Thrust SSC, driven by Royal Air Force pilot Andy Green, reached 763.035 mph on the Black Rock Desert Playa, becoming the first and only land vehicle to officially break the sound barrier. The run was possible because the playa, the floor of an ancient lake, is the flattest large surface in North America, with less than a meter of elevation variation across 310 square kilometers.

Between January 1951 and September 1992, the United States conducted 928 nuclear weapons tests at the Nevada Test Site in Nye County, averaging one explosion every 16 days. The site covers 1,360 square miles. The first 100 tests were conducted above ground and were visible from the Las Vegas Strip, briefly creating a tourist economy around watching the tests. In 1997, the National Cancer Institute estimated that fallout from the tests caused between 10,000 and 75,000 additional thyroid cancer cases in downwinder communities across Nevada, Utah, and Arizona. The test site was established on land taken from the Western Shoshone without their consent.

The shoreline terraces of the two ancient lakes remain visible today on mountainsides across the region. Geologist Grove Karl Gilbert published a 438-page monograph in 1890 reconstructing the history of Lake Bonneville from those waterlines. Explorer John C. Fremont named the Great Basin in 1844 without knowing what it was. The flat lines halfway up the mountains remain visible from Interstate 80.