Ada Kaleh (Romanian pronunciation: [ˈada kaˈle], Turkish: Adakale "Island Fortress", Hungarian: Újorsova or Ada Kaleh, Serbian and Bulgarian: Адакале / Adakale) was a small island on the Danube populated mostly by Turks that was submerged during the construction of the Iron Gates hydroelectric plant in 1970. The island was about 3 km downstream from Orşova and measured 1.75 by 0.4–0.5 km.
The isle of Ada Kaleh is probably the most evocative victim of the Iron Gate dam's construction. A Turkish exclave, it had a mosque and numerous twisting alleys, and was known as a free port and a smuggler's nest.
The Austrians built a Vauban-type fort there to defend it from the Ottoman Empire, and that fort would remain a bone of contention for the two empires. In 1699 the island came under Turkish control; but from 1716 to 1738 it was recaptured by the Austrians, and the Fortress of New Orsova was built by Nicolaus Doxat de Démoret, an Austrian colonel of Swiss origin. After a four-month siege in 1738 it was Turkish again, followed by the Austrians re-conquering it in 1789, but they had to return the island to the Turks with the Treaty of Sistova on August 4, 1791, which ended the Austro-Turkish War (1787–1791) (and, by extension, the Ottoman–Habsburg wars) between the Ottoman Empire and Habsburg Monarchy. Thereafter, the island lost its military importance.
Even though the Ottoman Turks lost the areas surrounding the island after the Russo-Turkish War (1877–1878) (and the Romanian War of Independence which was a part of the same conflict) the island was totally forgotten during the peace talks at the Congress of Berlin in 1878, which allowed it to remain a de jure Turkish territory and the Ottoman Sultan's private possession until the Treaty of Lausanne in 1923 (de facto until the Hungarian Kingdom unilaterally declared its sovereignty on the island in 1913.)
Between 1878 and 1918 the areas surrounding the island were controlled by Austria-Hungary, but the island was under Ottoman sovereignty. The Ottoman Government continued to appoint and send a nahiye müdürü (administrative head of a unit smaller than a district and bigger than a village) and a kadı (judge) regularly. The island's inhabitants (officially citizens of the Ottoman Empire) enjoyed exemption from taxes and customs and were not subject to conscription. The islanders also had the right to vote during the Ottoman general elections of 1908.
On May 12, 1913, the island was occupied by the forces of the Hungarian Kingdom of Austria-Hungary. It thus became known as Újorsova in the Krassó-Szörény County. This was one of the last unilateral territorial expansions of Hungary before the outbreak of the First World War; the seizure was never officially recognized by the Ottoman government.
Romania unilaterally declared its sovereignty in 1919 and strengthened its claim with the Treaty of Trianon in 1920. On July 24, 1923, Turkey officially ceded Ada Kaleh to Romania with Articles 25 and 26 of the Treaty of Lausanne; by formally recognizing the related provisions in the Treaty of Trianon.
The population lived primarily on the cultivation of tobacco and fishery, and later on tourism. In its last years of existence, the island's population ranged between 600 and 1,000 inhabitants. Before the island was covered by the waters of the Iron Gates dam, part of the population moved to Köstence in Romania and the rest to Turkey, invited by Prime Minister Demirel during his visit to the island.
The Ada Kaleh Mosque, dating from 1903, was built on the site of an earlier Franciscan monastery. The carpet of the mosque, a gift from the Turkish Sultan Abdülhamid II, was relocated to the Constanţa Mosque in 1965.
During the construction of the dam, some of the structures that were built on the island were relocated to the nearby Şimian Island, including part of the masonry of the fortress' catacombs, the Mosque, the bazaar, Mahmut Pasha's house, the graveyard and various other objects. However, the Ada Kaleh community decided to emigrate to Turkey after the evacuation of the island, instead of re-settling on Șimian Island. Also, a smaller part went to Dobruja, another Romanian territory with a Turkish minority, so the reconstruction of the "New Ada Kaleh" was never completed.
Ada Kaleh plays an important part in the novel of one of the most famous Hungarian authors, Mór Jókai. In the novel The Golden Man (Az Arany Ember), published in 1872, Ada Kaleh is called the "No One's Isle" and it becomes an almost mythical symbol of peace, seclusion and beauty, juxtaposed with the material outside world.
In Between the Woods and the Water, the second volume of Patrick Leigh Fermor's narrative of his journey across Europe, the author describes a delightful visit in 1934 with a group of elderly inhabitants and discusses the history of the island.
See also 
- (Romanian) Aşa a fost pe Ada Kaleh (This is how it was on Ada Kaleh), Jurnalul Naţional 7 November 2005
- (Romanian) Supravieţuitorii de pe insula scufundată de Ceauşescu (Survivors of the Island Submerged by Ceauşescu), Evenimentul Zilei 21 October 2006
- (Romanian) Ada Kaleh
- (Serbian) Ada Kale
- (English) The Old Island of Ada Kaleh
- (English) The Rebuilding of Ada Kaleh on Şimian Island
- (English) Ada Kaleh: the lost island of the Danube, Patrick Leigh Fermor, 22 Sept 2012.
- Adakale Island in River Danube
- Hürriyet Avrupa (European version of Hürriyet newspaper), 19–20 January 2013, p.12
- Jungmayer, Mihály: Ada-Kaleh. in: Zsebatlasz naptárral és statisztikai adatokkal. Szerk.: Kogutowitz, Károly Dr. és Hermann, Győző Dr. Magyar Földrajzi Intézet, Budapest, 1913.
- Full text of the Treaty of Lausanne (1923)
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