Yerevan is a mechanical industrial center in Transcaucasia, producing mobile power stations, automobiles, transformers, motors, machine tools and instruments. Synthetic rubber, chemical fertilizer, aluminum smelting, building materials, textiles, shoemaking, brewing, canning and other industries are also more important. There are thermal power plants and hydropower stations in the city, and there are several hydropower stations and a nuclear power station nearby, which is a large power hub. Tbilisi, Leninakan, Baku and Sevan are connected by railways, and several expressways meet here. Armenian Centre for Science, Education and the Arts. There are Armenian Academy of Sciences and its more than 80 scientific research institutions, Yerevan University and other institutions of higher learning, as well as history museums, literature and art museums, botanical gardens and so on. The city is divided into seven districts. Most of them are located on the left bank of the Razdan River. Lenin Square is located in the center of the city, where the Republic of Armenia and the city's administrative organs are located. Since 1960s, residential areas have been built in Achapnyak in the northwest and Noel-Zetong and Nolcke in the northeast. There is an annular green belt around the city. Yerevan has academies, research institutes and Yerevan University, as well as history museums, literature and art museums and botanical gardens. There are railways connecting Tbilisi, Leninakan and other places, and there are many expressways here for the railway crossing the Iranian capital Tehran, as well as airport facilities. 1988 65438+On February 7th, there was a big earthquake, which caused serious losses.