The Neutral Zone
The Neutral Zone is a place between two opposing territories where nobody from either territory may go. (Or at least nobody with weapons.) It's frequently found in Speculative Fiction, primarily Space Opera and Wagon Train to the Stars. The mere mention of the Neutral Zone by any Captain immediately prompts a Bridge Bunny to remind us that for any starship from either The Federation or The Empire to enter it is considered an act of war. Naturally, there will be some tempting reason to enter the Zone anyway. Planets in or near the Neutral Zone are frequently disputed territories, and are often sources of Applied Phlebotinum. In space settings, it is rarely if ever explained exactly how a Neutral Zone would be enforced, given that the huge distances and 3D nature of space mean it's not a simple as "put checkpoints at these mountain passes and make sure everyone has the right passports". The flip side of this is the Truce Zone, where opposing sides are encouraged to come in and mingle as long as they behave.
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- In the novel Succession (published in the UK as The Risen Empire), there's an area called the Plague Axis where medicine is avoided so that the people will build up natural immunity to various pathogens. This area contains representatives from the four main galactic powers, and is not considered to be affiliated with any of them. Entering it isn't exactly an act of war, though it will make the other powers suspicious.
Live Action TV
- Star Trek had three neutral zones, separating each of the three primary powers from one another: The United Federation of Planets, the Romulan Star Empire and the Klingon Empire (after the events of the sixth film, the neutral zone between the Federation and the Klingons no longer exists, as the two governments entered into an alliance instead of being enemies). Generally, "The Neutral Zone" refers to the Zone between the United Federation of Planets and Romulan Star Empire, otherwise called the Romulan Neutral Zone, as it was the first and longest lasting Neutral Zone. The Planet of Galactic Peace was where the borders of all three powers meet. Though not quite as exclusive as a Neutral Zone, the Demilitarized Zone between the United Federation of Planets and the Cardassian Union has many of the same features, but does allow some travel, communication and settlement for various reasons. Military vessels are prohibited unless a joint operation can be arranged, as is either party arming their colonists (not that such regulations stopped either group of colonists from arming themselves). Ironically, quite a few episodes that involved the Romulans started with one of the two factions - or both - illegally entering the Zone for some reason.
- Battlestar Galactica has (had) the Armistice Line.
- There are also the Uncharted Territories from Farscape, part of which acts as a buffer between the Scarrans and the Sebacean Peacekeepers, while the rest is simply the vast unknown beyond the parts of space that have been explored and mapped by either major power.
- Negotiating these is common as part of an alliance. Their advantage is that it guarantees the alliance (because no one can advance their troops far enough to hurt the other without being noticed). The disadvantage is that everyone else will know they are allied. One of the more interesting snarls analyzed by Diplomacy fanatics is the Italian/Austrian border. On that one, each player has a military unit right next to a rival supply center; if a neutral zone agreement made at the beginning of the game is betrayed, that could permanently cripple one player and start the other with a great advantage.
- More directly, Switzerland is outright stated as being impassible by any unit. Implicitly by not being labelled, all islands on the map save for Great Britain are also impassible.
- Traveller: there is mention of an Imperial/Zhodani DMZ in the volume Behind the Claw. Details are not given.
- In Mass Effect 2, Planet Tuchanka (the krogan homeworld) is in a sector known as the Krogan DMZ. That being said, while Tuchanka is free to remain a battlefield between the warring factions, the restrictions are in place to prevent the mobilisation of a standing army and Space Navy that might threaten Citadel Space.
- May also apply to the buffer between Citadel Space and the Terminus Systems. Any incursion from an armed force greater than say, a Spectre, is seen as an act of aggression and is likely to trigger a very strong response that may even lead to war. This is despite the fact that aside from Aria T'Loak on Omega, there is no unified leader or government amongst the various disparate factions that operate within the Terminus Systems.
- Until the events of the first game, the Perseus Veil unofficially served as this between the rest of the galaxy and Geth-controlled space.
- In Chaotic, the Doors of the Deepmines was a location were the tribes of Perim were forbidden to engage in combat even though all four are currently at war. This was probably to prevent any damage to the the location that acts as the prison containing M'arrillian tribe.
- Switzerland's neutrality has gone to a point that jokes about it have become cliché.
- Saudi Arabia once had neutral zones with both Iraq and Kuwait. Rather than the buffer zones as seen in Star Trek, they were simply areas where the exact location of the border hadn't been determined. Both ceased to exist when the border disputes were settled. 1970 for the Saudi-Kuwaiti neutral zone and 1981 for the Saudi-Iraqi neutral zone, though for unknown reasons in the latter case no one outside of Saudi Arabia and Iraq was informed of the treaty for another 10 years. As a result, maps made prior to 1991 depicted a neutral zone that did not actually exist.
- That used to be fairly common in the Middle East and North Africa, and most states had large areas over which control was dubious. In fact, even now that the borders are settled, control is still dubious—the borders are only controlled around the transportation links. There tend not to be fences along more than a few miles of border, and as for the rest, gigantic deserts serve as a decent substitute for border control (you try crossing the Sahara or the Empty Quarter without passing too close to a major route or dying). The main exception is Israel's borders, where the desert is small enough not to be a deterrent.
- The Demilitarized Zone between North Korea and South Korea, in business since 1953 (though it's demilitarized In Name Only [read: it's full of land mines] to remain neutral).
- Sailors and members of the other branches of the armed forces stationed in South Korea are repeatedly warned that if one decides to enter the Korean DMZ, he or she is no longer under the protection of their home nation. They are on their own, which is why entering the DMZ in the first place is strongly discouraged.
- An unintended positive side effect of this is that the whole Korean DMZ has been more or less untouched by humans for over fifty years, and as a result has been overrun by wild plants and animals, including several threatened and endangered species (such as the Red-crowned Crane and the Amur Leopard, the latter of which is critically endangered). In fact, several bird species are likely to go extinct if peace is ever restored.
- The Vietnamese Demilitarized Zone, established after the French left as a result of the First Indochina War, was eventually utterly ignored by the North Vietnamese during the Vietnam War.
- The Berlin Wall's "death strip".
- There was a demilitarized zone in the Rhineland of western Germany between World War I and Hitler's taking over of it in 1936.
- Although this wasn't the first time it had been taken over. In 1924 the French and Belgians occupied the Rhineland in protest at tardy German repayment of reparations.
- Buffer states can serve as neutral zones between two larger powers in order to forestall conflict between them. How successful the states in question serve as neutral zones to the big powers on either side of it largely depends on how much its leaders can play the rivals off one another without falling squarely into one side's camp.
- In American Football, the neutral zone is the strip of field running from sideline to sideline marked by where each end of the football is located after the referee spots it. No player except the center is allowed inside this area before the ball is snapped - if a player lines up in the neutral zone (or beyond) when the ball is snapped, it's a five-yard offside penalty on the offending team (the play, however, will be allowed to continue to its normal completion - the offended team will then have the option of taking either the play's result or the penalty).
- A "neutral zone infraction" is called if a defensive player jumps into this area (or beyond) and causes an offensive player to react to the big guy suddenly charging towards him - the play is blown dead and a five-yard penalty on the defense is assesed (unlike an offsides penalty, the penalty will always be enforced as there was no play at all).note