Mykolaiv (Ukrainian: Микола́їв, translit. Mykolajiv [mɪkɔˈlɑjiu̯]), also known as Nikolaev or Nikolayev (from Russian: Никола́ев, translit. Nikolajev [nʲɪkɐˈlajɪf]), is a city in southern Ukraine, the administrative center of the Mykolaiv Oblast. Mykolaiv is arguably the main shipbuilding center of the Black Sea. Aside from three shipyards within the city, there are a number of research centers specializing in shipbuilding such as the State Research and Design Shipbuilding Center, Zoria-Mashproekt and others. The city has a population of 494,763 (2015 est.).