sentences:  Tsentralny City District, comprising the central portion of, is by far the smallest out of four in terms of the area, and the other three have comparable areas, with Lazarevsky City District being the biggest.In terms of the population, Tsentralny City District is approximately twice as big as each of the other three city districts.Tsentralny City District, or central Sochi, covers an area of and, as of the 2010 Census, has a population of 137,677.