Adakaleh
Adakaleh (nicknamed Ottoman Atlantis) was a small island in the Danube River at the Carpathian Mountains, opposite on the other bank of Orşova and  Tekija. From 1699 onward, it was a part of the Ottoman Empire, until the Treaty of Lausanne in 1923. After that, it was owned by the Kingdom of Romania. In 1939, many Turkish people left Ada Kaleh and settled in Turkey. The Island was flooded in 1968-1971, when a dam was made by the Socialist Republic of Romania and Yugoslavia. The island has been underwater since then. The people who used to live on the island were Turkish speaking Sufism-Muslims Turks. In 1967, before the island was flooded, the Turkish people on the island went to other places in Mainland Romania to Dobruja, but most of the people went to Turkey.