Earth-1

"This Earth is at the center of the multiverse. It's the access point to every other Earth in existence."

- Hunter Zolomon, referring to Earth-1

Earth-1 is a universe parallel to a plethora of others, such as Earth-2. The name was coined by Martin Stein. To Earth-2 citizens, Earth-1 was initially referred to as Earth-2. Also, to Earth-17's citizens, it is known as Terra Prime.

Earth-1 is particularly important in that it is a central junction in the multiverse, being the middle intersection from which one can travel to any other alternate Earth.

History
After learning of the existence of parallel worlds, Martin Stein coined the world's name, "Earth-1", to describe Team Flash's relative position in regards to all of the other worlds. Beginning in the early 21st century, it has become home to numerous groups of extraordinary protectors, such as the vigilante unit Team Arrow, the scarlet speedster known as the Flash and his team of allies who emerged after the explosion of the S.T.A.R. Labs particle accelerator that gave rise and prominence to superpowered meta-humans, and John Constantine's group of mystical allies. Even in other times, similar such heroes operate, such as the secret mid-20th century alliance the Justice Society of America, and the time-travelling Legends, who are associated with the top-secret organization of the Time Bureau.

A.D.

 * Damien Darhk's assault on
 * Launch of the Spirit of St. Louis (1927)
 * Nazi invasion (2017)
 * Launch of the Spirit of St. Louis (1927)
 * Nazi invasion (2017)
 * Launch of the Spirit of St. Louis (1927)
 * Nazi invasion (2017)
 * Launch of the Spirit of St. Louis (1927)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)
 * Nazi invasion (2017)

Timeline alterations

 * Flashpoint (briefly; erased due to Barry's restoration of the timeline)
 * Legion of Doom's alternate reality (briefly; erased due to the Legends' intervention)
 * Anachronisms (formerly; timeline fixed by the Legends)

From Earth-3

 * Jay Garrick/The Flash

From Earth-19

 * Cynthia/Gypsy
 * Josh/Breacher
 * H.R. Wells (became permanent resident, deceased)

From Earth-38

 * Alex Danvers
 * Kara Danvers/Supergirl
 * Querl Dox/Brainiac 5
 * Mon-El
 * J'onn J'onzz/Martian Manhunter
 * Clark Kent/Superman

From Earth-90

 * Barry Allen/The Flash

From Earth-221

 * Harrison Sherloque Wells

From Earth-X

 * "The Ray" (deceased)
 * Tommy Merlyn/Prometheus (deceased)
 * Oliver/Dark Arrow (deceased)
 * Leo Snart
 * Kara/Overgirl (deceased)
 * Laurel Lance/Siren-X

From The Monitor's realm

 * Mar Novu/The Monitor

From unknown Earths

 * "Music Meister"

Known locations

 * Asgard
 * Valhalla
 * Earth
 * Africa
 * Egypt
 * Alexandria
 * Kahndaq
 * Shiruta
 * Somalia
 * Mogadishu
 * South Africa
 * Sudan
 * Khartoum
 * Tanzania
 * Mount Kilimanjaro
 * Zambesi
 * M'Changa Province
 * Zambesi Village
 * Atlantic Ocean
 * North Atlantic Ocean
 * Antarctica
 * Asia
 * Afghanistan
 * Bhopal
 * Bialya
 * China
 * Beijing
 * Great Wall of China
 * Hong Kong
 * Jiaju
 * Lian Yu
 * Shanghai
 * Yunnan Province
 * Hindu Kush
 * Nanda Parbat
 * India
 * Maliku
 * Japan
 * Tokyo
 * Qurac
 * Tibet
 * Vietnam
 * Europe
 * France
 * Fontainebleau Forest
 * Saint-Lô
 * Paris
 * Germany
 * Leipzig
 * Italy
 * Mount Vesuvius
 * Rome
 * Sicily
 * Kasnia
 * Markovia
 * Markovburg
 * Norway
 * Olympus
 * Russia
 * Chechnya
 * Kizylar
 * Krasnoyarsk
 * Moscow
 * Spain
 * Ukraine
 * United Kingdom
 * England
 * London
 * Merseyside
 * Liverpool
 * Newcastle
 * Northern England
 * Northern Ireland
 * Scotland
 * Wales
 * Jefferson City
 * North America
 * Aruba
 * Bahamas
 * Canada
 * Vancouver
 * Cuba
 * United States of America
 * Alabama
 * Birmingham
 * Blüdhaven
 * Blue Valley
 * California
 * Coast City
 * Fresno
 * Los Angeles
 * Hollywood
 * Silicon Valley
 * Calvin City
 * Colorado
 * Florida
 * Miami
 * Georgia
 * Atlanta
 * Gotham City
 * Hope Springs
 * Hub City
 * Illinois
 * Chicago
 * Opal City
 * Ivy Town
 * Kentucky
 * Briarwood
 * Louisiana
 * New Orleans
 * St. Roch
 * Keystone City
 * Maine
 * Masonville
 * Massachusetts
 * Salem
 * Michigan
 * Detroit
 * Midway City
 * Missouri
 * Central City
 * Montana
 * Billings
 * Mount Buccelato
 * New York
 * New York City
 * Brooklyn
 * Manhattan
 * Nevada
 * Las Vegas
 * North Dakota
 * Oklahoma
 * Tulsa
 * Oregon
 * Harmony Falls
 * Redmond
 * Pennsylvania
 * Heddwich
 * Pittsburgh
 * South Dakota
 * Star City
 * Tennessee
 * Memphis
 * Wisconsin
 * Virginia
 * Reston
 * Washington
 * Seattle
 * Washington, D.C.
 * Oceania
 * Australia
 * Melbourne
 * Perth
 * Sydney
 * New Zealand
 * Milford Sound
 * Wellington
 * South America
 * Corto Maltese
 * Guyana
 * Peru
 * The Refuge
 * Themyscira
 * Thanagar
 * Vanishing Point
 * South America
 * Corto Maltese
 * Guyana
 * Peru
 * The Refuge
 * Themyscira
 * Thanagar
 * Vanishing Point

Arrow
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Season 7
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The Flash
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Season 5
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Vixen
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Season 2
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DC's Legends of Tomorrow
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Season 4
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Trivia

 * Earth-1 vibrates at a lower frequency than Earth-2.