List Of Sets Of Four Countries That Border One Another
This is a list of sets of at least four countries that border one another. In the typical case, three countries that border one another form a ring around a landlocked fourth. Examples of states in the centers of such configurations include Burundi, Luxembourg, Malawi and Paraguay.
No more than four contiguous countries can share borders, since the complete graph K5 is not planar. On the other hand, non-contiguous countries that have exclaves and dependent territories may form sets of five or more. Also, when regarding point borders as borders (e.g. Utah and New Mexico at the U.S.'s four corners), theoretically any number of regions may meet in one point, and can be considered all bordering one another.
As of the 2006 breakup of the State Union of Serbia and Montenegro, there are at least twelve four-country sets in the world in which each country shares a boundary (land or fresh water) with the others (thirteen when including states with limited recognition).
Read more about List Of Sets Of Four Countries That Border One Another: Near Misses, Former Border Sets of At Least Four Countries, See Also
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