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EDIT: Welp, it appears I’ve missed some! [Here is an updated map](http://imgur.com/H8NVHwE)!
Added the [Gulf Cooperation Council](http://en.wikipedia.org/wiki/Cooperation_Council_for_the_Arab_States_of_the_Gulf) between Kuwait, Saudi Arabia, Bahrain, Qatar, UAE, and Oman.
Add the [Central America-4 Border Agreement](http://en.wikipedia.org/wiki/Central_America-4_Border_Control_Agreement) between Guatemala, El Salvador, Honduras, and Nicaragua.
I found an even larger agreement between Russia and its neighbors, the [Eurasian Economic Community](http://en.wikipedia.org/wiki/Eurasian_Economic_Community), which includes Russia, Belarus, Kazakhstan, Kyrgyzstan, and Tajikistan. Union State still exists, but it’s covered by this agreement, too. Russia’s a bit confusing because starting next year, there will also be the [Eurasian Economic Union](http://en.wikipedia.org/wiki/Eurasian_Economic_Union), which is only between Russia, Belarus, and Kazakhstan.
Someone mentioned the [Nordic Passport Union](http://en.wikipedia.org/wiki/Nordic_Passport_Union), which is not on this map. However, all of its members except the Faroe Islands are part of Schengen anyway, so I didn’t include it. I also put countries that are obliged to join Schengen but haven’t yet in light blue.
I got the info from a [wikipedia article](http://en.wikipedia.org/wiki/Open_borders) about open borders. It noted that the list may be incomplete, so please let me know if there’s one I missed.
There are currently six agreements which allow the free movement of people.
[Schengen Area](http://en.wikipedia.org/wiki/Schengen_Area), basically EU countries with some exceptions like Switzerland, Norway, UK, etc. Vatican, Monaco, and San Marino are de facto Schengen, as they haven’t officially signed onto it but don’t maintain border controls.
[Common Travel Area](http://en.wikipedia.org/wiki/Common_Travel_Area) between the UK, Ireland, the Isle of Man, Jersey, and Guernsey.
[Union State](http://en.wikipedia.org/wiki/Union_State), between Belarus and Russia.
[Union of South America Countries](http://en.wikipedia.org/wiki/Union_of_South_American_Nations), UNASUR, between all South American countries except French Guyana (yes, I know French Guyana is not a country).
[Treaty of Peace and Friendship](http://en.wikipedia.org/wiki/1950_Indo-Nepal_Treaty_of_Peace_and_Friendship), between India and Nepal.
[Trans-Tasman Travel Arrangement](http://en.wikipedia.org/wiki/Trans-Tasman_Travel_Arrangement), between Australia, New Zealand, Ni’ue, and the Cook Islands.
The article also mentioned an agreement between Turkey and Northern Cyprus, but it had no citation and I couldn’t find any further info, so I didn’t include it.
^^^^open ^^^^borders ^^^^for ^^^^us ^^^^and ^^^^canada ^^^^pls