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List of sets of four countries that border one another : ウィキペディア英語版 | 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 is not planar. On the other hand, non-contiguous countries that have exclaves (sometimes in the form of dependent territories) may form sets of five or more. Also, when regarding point borders as borders (e.g. Utah, Arizona, New Mexico and Colorado at the Four Corners in the U.S.), theoretically any number of regions may meet at one point and all may be considered as 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). ==Africa==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「List of sets of four countries that border one another」の詳細全文を読む
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