Türkmenbaşy, formerly known as Krasnovodsk and Kyzyl-Su, is a city in Balkan Province in Turkmenistan, on the Krasnovodsk Gulf of the Caspian Sea. It sits at an elevation of 27 metres (89 feet). The population (est 2004) was 86,800, mostly ethnic Russian, Armenians and Azeri. As the terminus of the Trans-Caspian Railway, it was an important transportation center.