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In international law, a condominium (plural either ''condominia'', as in Latin, or condominiums) is a political territory (state or border area) in or over which multiple sovereign powers formally agree to share equally ''dominium'' (in the sense of sovereignty) and exercise their rights jointly, without dividing it up into 'national' zones. Although a condominium has always been recognized as a theoretical possibility, condominia have been rare in practice. A major problem, and the reason so few have existed, is the difficulty of ensuring co-operation between the sovereign powers; once the understanding fails, the status is likely to become untenable. The word is recorded in English since c. 1714, from Modern Latin, apparently coined in Germany c. 1700 from Latin ''com-'' "together" + ''dominium'' "right of ownership" (compare domain). A condominium of three sovereign powers is sometimes called a tripartite condominium or tridominium. == Current condominia == * Antarctica is a ''de facto'' condominium, governed by parties to the Antarctic Treaty that have consulting status. * The Moselle River and its tributaries, the Sauer and the Our, constitute a condominium between Luxembourg and Germany, which share bridges and at least the tip of one island, ''Staustufe Apach'',〔(【引用サイトリンク】 ''Select'' DEFRLUBEDELU.PDF (Map of condominium boundaries) )〕 near Schengen (the rest of the island is in France). The condominium was established by treaty in 1816. * Pheasant Island (also known as Conference Island, ''Konpantzia'' in Basque, ''Île de la Conférence'' in French or ''Isla de los Faisanes'' in Spanish) in the River Bidassoa between France and Spain. It was established by the Treaty of the Pyrenees in 1659. * El Salvador, Honduras and Nicaragua exercise a tridominium over parts of the Gulf of Fonseca and of the territorial sea outside its mouth. * Austria and Germany consider themselves, together with Switzerland, to hold a tripartite condominium (albeit on different grounds) over the main part of Lake Constance (without its islands). On the other hand, Switzerland holds the view that the border runs through the middle of the lake. Hence no international treaty establishes where the borders of Switzerland, Germany, and Austria in or around Lake Constance lie.〔 * The part of the Paraná River between the Salto Grande de Sete Quedas and the mouth of the Iguassu River is shared in condominium by Brazil and Paraguay. * Jamaica and Colombia share a maritime condominium (called a "Joint Regime Area") by mutual agreement as an alternative to delimiting their sea boundary. The outer portion of the EEZ of each country otherwise would overlap in this area. Unlike other "joint development zones", this condominium appears not to have been purposed simply as a way to divide oil, fisheries or other resources. 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「Condominium (international law)」の詳細全文を読む スポンサード リンク
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