Şimian is a river island on the Danube

Danube

The Danube is a river in the Central Europe and the Europe's second longest river after the Volga. It is classified as an international waterway....

 belonging to Romania

Romania

Romania is a country located at the crossroads of Central and Southeastern Europe, on the Lower Danube, within and outside the Carpathian arch, bordering on the Black Sea...

, just downstream of the city of Turnu Severin and overlooking the town of Şimian

Simian, Mehedinti

Şimian is a commune located in Mehedinţi County, Romania. It is composed of eight villages: Cerneţi, Dedoviţa Nouă, Dedoviţa Veche, Dudaşu, Ergheviţa, Poroina, Şimian and Valea Copcii.-References:...

. The island is home to the reconstructed fortress relocated from the historic Ada Kaleh

Ada Kaleh

Ada Kaleh 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....

 island, when it was due to be submerged by the Iron Gate I dam building in 1968. For that reason, it is also known as the "New Ada Kaleh", although the ambitious resettlement plan has never been completed.

During the construction of the Trajan's Bridge

Trajan's bridge

Trajan's Bridge or Bridge of Apollodorus over the Danube was a Roman segmental arch bridge, the first to be built over the lower Danube. For more than a thousand years, it was the longest arch bridge in the world, in terms of both total and span length...

in the 2nd century AD, the island served as a natural base for water dividing dams.