Medgidia (Romanian pronunciation: [med͡ʒiˈdi.a] ⓘ or [med.d͡ʒiˈdi.a]; historical Turkish names: Karasu or Carasu, Mecidiye or Megidie) is a city in Constanța County, Northern Dobruja, south-eastern Romania.

The settlement named "Karasu" (Turkish for "Black Water") was mentioned on the map of Iehuda ben Zara in 1497, in the notes of Paolo Giorgio (1590) and Evliya Çelebi (1653).

It was built as a planned city to accommodate refugees from the Crimean War and to serve as an economic hub for the central zone of Dobruja.

The general aspect of the relief is that of a low plateau with a limestone structure, covered with thick deposits of loess.

Medgidia lies in the center of an agricultural area of several tens of millions hectares, with a fertile soil and provided with irrigation systems.

The facility is officially designated and operated as a civilian radar station by the National Meteorological Administration, however the data is fed into the NATO Integrated Air Defense System as well.

The A2 highway from Bucharest to Constanța, partially financed by the European Union, bypasses the town, allowing the development of associated services (hotels, petrol stations and a parking yard for trucks) in the area.

It was opened in 1964 with exhibitions of Romanian contemporary painting, sculpture, and graphics, signed Lucian Grigorescu, Marius Bunescu, Ion Jalea, and others.

The building respects the traditional form of the Muslim cultural placements, decorated in the interior with oriental ornaments and inscriptions in Arabic.

The church was built in a Roman-Greek style and it was raised with the contribution of the local Christians on the ruins of a Roman castrum.

In 1926, Medgidia commemorated the heroism of the First Serbian Volunteer Division, which fought in Dobruja during World War I as a part of the bloody Romanian theatre, by inaugurating a monument in the group's honor.

The completed memorial, featuring an iconic white marble pyramid, was the setting of a ceremony held with the participation of both Romanian and Yugoslavian officials.